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+metadata, and any other content or labor, has been confirmed to be
+in the PUBLIC DOMAIN IN THE UNITED STATES.
+
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+Project Gutenberg (https://www.gutenberg.org) public repository for
+eBook #67134 (https://www.gutenberg.org/ebooks/67134)
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-The Project Gutenberg eBook of Dairy Disagreeables Busy the
-Bacteriologists, by F. H. Hall
-
-This eBook is for the use of anyone anywhere in the United States and
-most other parts of the world at no cost and with almost no restrictions
-whatsoever. You may copy it, give it away or re-use it under the terms
-of the Project Gutenberg License included with this eBook or online at
-www.gutenberg.org. If you are not located in the United States, you
-will have to check the laws of the country where you are located before
-using this eBook.
-
-Title: Dairy Disagreeables Busy the Bacteriologists
-
-Authors: F. H. Hall
- H. A. Harding
- L. A. Rogers
- G. A. Smith
-
-Release Date: January 9, 2022 [eBook #67134]
-
-Language: English
-
-Produced by: Charlene Taylor, David E. Brown, and the Online Distributed
- Proofreading Team at https://www.pgdp.net (This file was
- produced from images generously made available by The
- Internet Archive)
-
-*** START OF THE PROJECT GUTENBERG EBOOK DAIRY DISAGREEABLES BUSY THE
-BACTERIOLOGISTS ***
-
-
-
-
-
- POPULAR EDITION.
-
- BULLETIN No. 183. DECEMBER, 1900.
-
- New York Agricultural Experiment Station.
-
- GENEVA, N. Y.
-
- [Illustration]
-
- DAIRY DISAGREEABLES BUSY THE BACTERIOLOGISTS.
-
- F. H. HALL, H. A. HARDING, L. A. ROGERS AND G. A. SMITH.
-
- PUBLISHED BY THE STATION.
-
-
-
-
-BOARD OF CONTROL.
-
-
- GOVERNOR THEODORE ROOSEVELT, Albany.
- STEPHEN H. HAMMOND, Geneva.
- AUSTIN C. CHASE, Syracuse.
- FRANK O. CHAMBERLAIN, Canandaigua.
- FREDERICK C. SCHRAUB, Lowville.
- NICHOLAS HALLOCK, Queens.
- LYMAN P. HAVILAND, Camden.
- EDGAR G. DUSENBURY, Portville.
- OSCAR H. HALE, North Stockholm.
- MARTIN L. ALLEN, Fayette.
-
-
-OFFICERS OF THE BOARD.
-
- STEPHEN H. HAMMOND, _President_.
- WILLIAM O’HANLON, _Secretary and Treasurer_.
-
-
-EXECUTIVE COMMITTEE.
-
- STEPHEN H. HAMMOND,
- MARTIN L. ALLEN,
- FRANK O. CHAMBERLAIN,
- FREDERICK C. SCHRAUB,
- LYMAN P. HAVILAND,
- NICHOLAS HALLOCK.
-
-
-STATION STAFF.
-
- WHITMAN H. JORDAN, SC. D., _Director_.
-
- GEORGE W. CHURCHILL, _Agriculturist and Superintendent of Labor_.
-
- WILLIAM P. WHEELER, _First Assistant_ (_Animal Industry_).
-
- FRED C. STEWART, M.S., _Botanist_.
-
- LUCIUS L. VANSLYKE, PH.D., _Chemist_.
-
- CHRISTIAN G. JENTER, PH.C.,
- [A]WILLIAM H. ANDREWS, B.S.,
- J. ARTHUR LECLERC, B.S.,
- [B]AMASA D. COOK, PH.C.,
- FREDERICK D. FULLER, B.S.,
- [B]EDWIN B. HART, B.S.,
- [A]CHARLES W. MUDGE, B.S.,
- [A]ANDREW J. PATTEN, B.S., _Assistant Chemists_.
-
- HARRY A. HARDING, M.S., _Dairy Bacteriologist_.
-
- LORE A. ROGERS, B.S., _Assistant Bacteriologist_.
-
- GEORGE A. SMITH, _Dairy Expert_.
-
- FRANK H. HALL, B.S., _Editor and Librarian_.
-
- VICTOR H. LOWE, M.S.,
- [C]F. ATWOOD SIRRINE, M.S., _Entomologists_.
-
- PERCIVAL J. PARROTT, A.M., _Assistant Entomologist_.
-
- SPENCER A. BEACH, M.S., _Horticulturist_.
-
- HEINRICH HASSELBRING, B.S.A., _Assistant Horticulturist_.
-
- FRANK E. NEWTON,
- JENNIE TERWILLIGER, _Clerks and Stenographers_.
-
- ADIN H. HORTON, _Computer_.
-
-Address all correspondence, not to individual members of the staff, but
-to the NEW YORK AGRICULTURAL EXPERIMENT STATION, GENEVA, N. Y.
-
-The Bulletins published by the Station will be sent free to any farmer
-applying for them.
-
-
-
-
-POPULAR EDITION[D]
-
-OF
-
-BULLETIN NO. 183.
-
-DAIRY DISAGREEABLES BUSY THE BACTERIOLOGISTS.
-
-F. H. HALL.
-
-
-FLAVOR IN MILK AND ITS PRODUCTS.
-
-[Sidenote: =Flavor: How tested?=]
-
-Good flavor sells milk, cream, butter and cheese; poor flavor condemns
-them. Flavor is that indescribable something, which, in good dairy
-products, appeals pleasantly to our senses, but often passes unnoticed
-because so familiar; in poor products it is equally indescribable, but
-more often characterized in vigorous language, when “frowzy” butter,
-“garlicy” milk, “bitter” cream or “strong” cheese present their
-offensive odors and tastes. The ordinary consumer calls flavor the
-“taste” of the article which tickles his palate; but the expert knows
-that the nerves of smell play the larger part, and he depends for his
-judgment largely upon a trained nose. Hence we see the butter judge
-or cheese scorer pass the trier beneath his nostrils with deep-drawn
-breath and meditative study of the aroma which arises. Smells, however,
-cannot be measured in degrees or separated into their elements by the
-spectroscope; therefore we have to depend upon general terms, often
-differing with the different experts, in our discussion of flavor; yet
-we have some well-marked classes which serve as a basis for reference.
-
-[Sidenote: =Faults of flavor classified.=]
-
-We can separate the faulty flavors into classes by their origin. The
-minute particles thrown off by dairy products, whose impact upon tongue
-or nostrils give rise to taste or smell, may come (1) from compounds in
-the food of the cow or developed in her body (2) from matters, other
-than germs, taken up by the milk while it stands in poorly-ventilated
-stables or rooms reeking with foul smells, or (3) from substances which
-are the direct or indirect result of the activity of living organisms
-in the milk.
-
-Odors of the first class will be most noticeable while the milk is
-warm from the cow and will not increase with time. They are really
-far less common than dairymen generally believe and may be avoided
-almost entirely by careful feeding. Garlic, turnips, cabbage and such
-“fragrant” edibles will, of course, taint the milk if they are fed
-within a few hours before milking; but when fed soon after the cows are
-milked, the volatile oils to which these odors are due will generally
-disappear from the animal’s system before the next morning or evening.
-
-Too often odors of the second class are assigned to the first, and
-the old cow takes the blame for man’s fault; as milk very readily and
-quickly takes up smells and tastes from its surroundings. When the
-owner delivers milk to the factory and is told that it “smells bad,” he
-forgets that he or his men let it stand in the uncleaned stable to draw
-in the “cowy” and worse odors, while the cows were being fed and some
-other chores attended to; or that they poured it into pails that lacked
-a little of perfect sweetness; and he immediately says; “I’ve got to
-stop feeding silage.” “The cows ate some cabbage trimmings last night,”
-or, “Someone forgot to close the rye-field gate.”
-
-Odors of these two classes, due to volatile compounds in the milk, are
-of most importance in the milk and cream trade, as the faults largely
-disappear in making butter and cheese. Thorough æration is often
-helpful in the removal of such flavors.
-
-Odors of the third class, except in some very rare cases where the
-udder itself is the seat of colonies of bacteria, are not observed in
-freshly-drawn milk. The bacteria, molds and yeasts which cause them
-must have a chance to develop and to set up chemical changes in the
-milk; and this rarely occurs to any great extent within 12 hours from
-the time the milk is drawn. A high temperature, however, is favorable
-to growth of these low forms of plant life; so in warm weather milk
-faults are common. In butter-making, and in cheese-making, also,
-the heat often used to ripen the cream and the high temperature at
-which the milk is held in “setting” and “cooking” the curd, furnish
-conditions very favorable to the germs present and they develop with
-great rapidity. In their growth part of the milk is used for food and
-in its breaking down into simpler compounds the aromatic substances
-which make flavor, good or bad, are formed.
-
-The flavor of good milk and cream, then, is an inherent quality due
-to the normal constituents of the milk; the flavors of butter, both
-good and bad, except that due to the fat and to odors absorbed by the
-milk, are held to be the result of bacterial action; the fundamental
-flavors of cheese are probably due to chemical decomposition, started
-by unorganized ferments known as enzyms; joined with which are other
-flavors marking the individual cheeses, which are probably due to
-bacteria; and it has recently been found that in some cases yeasts have
-been the cause of bad flavor.
-
-
-FISHY FLAVOR IN MILK.
-
-[Sidenote: =Ready Relief.=]
-
-This peculiar smell, as though the milk had set in a close room with
-a barrel of not-too-fresh fish, was brought to the attention of the
-Bacteriologist by a dealer who had already located it as coming from
-the milk of a certain dairy. The dairyman is a more than ordinarily
-careful milk-handler, who gladly coöperated with the Station in efforts
-to locate the trouble in his herd. Bottles were supplied by the
-Bacteriologist, which had been steamed to insure the death of all germ
-life and then sealed. These sealed bottles were taken by the dairyman
-to his farm; at milking time each was opened long enough to receive a
-little milk from each quarter of the udder of a single cow; and then
-re-sealed. All were brought to the Station; and, upon examination, the
-odor was found only in the milk of one cow. The owner rejected her milk
-and heard no further complaint, from the dealer, of bad smells. This
-was the practical point; and it was thus easily and simply gained.
-
-[Sidenote: =Cause not found.=]
-
-From the scientist’s standpoint, though, only a beginning had been
-made; the real cause of the trouble was as yet unknown; nor was any
-satisfactory solution reached even after a long investigation. The
-flavor could hardly come from the food, for all the cows were fed alike
-and no objectionable weeds were found in their pasture. The cow seemed
-perfectly healthy and no evidence of inflammation or disease could be
-found on the udder or in the milk. Neither could any form of bacteria
-be found in the milk, which, in cultures or introduced into the udder
-of a healthy cow, would reproduce the fishy smell.
-
-[Sidenote: =Rare fault.=]
-
-At least two other cases of similar flavor have been known; but no
-cause was evident in either case. The trouble is very infrequent, at
-worst, and is here discussed mainly to show how easily a trouble due to
-one cow can be located by taking individual samples of the milk; and
-how cheaply gotten rid of by leaving out the objectionable product.
-
-
-BITTER FLAVOR IN NEUFCHATEL CHEESE.
-
-[Sidenote: =An uncompleted study.=]
-
-A little better result than that in the study of fishy flavor was
-reached in the investigation of a bitter flavor in Neufchatel cheese;
-but this study also had to be left incomplete. The trouble in the
-factory was easily remedied; and the germ responsible for the outbreak
-was obtained in pure culture; but full study of the fault in all its
-bearings was hindered by the refusal of the herd owner to admit that
-the trouble was due to his milk. The investigation had to stop with the
-guilty herd; it did not locate the original source of infection.
-
-[Sidenote: =Method of detection.=]
-
-This bitter flavor is not the same as the bitterness quite common in
-milk and cream at certain seasons of the year; as the milk itself
-tasted and smelled all right until well along in the process of
-cheese-making when the curd was being ærated and drained. The flavor
-was noticed in the factory in October and could not be checked, though
-the maker took great pains to wash and scald all his utensils and
-everything which touched the milk after it came from the farm. To
-locate the trouble, samples were taken of the milk of each patron
-and the cheese-making process started with each sample. In 18 hours
-all the samples of curd appeared normal but two, which were gassy
-and bad-smelling; and one of these, when drained and exposed to the
-air, showed a pronounced bitter flavor. This sample proved to be from
-the dairy which had furnished the milk for making the Neufchatel,
-a milk specially selected because of its high fat-content. This
-furnished direct proof that the fault lay in the milk, not in its
-factory handling; and rejection of this milk ended the trouble in the
-Neufchatel. As already stated, the study could not be carried into the
-herd to see whether one cow, wrong stable surroundings, a stagnant pool
-of water or contaminated dairy utensils were to blame for the trouble
-in the factory.
-
-[Sidenote: =Bacteria blamable.=]
-
-Samples of this faulty milk were taken for laboratory study and various
-bacteria and molds were separated. This was done by diluting the milk
-with a sterilized fluid so that the germs were quite widely separated
-when the milk was poured out in flat glass dishes. Each kind of germ
-is marked by some peculiarity of growth which makes it possible to
-distinguish between them; and pure cultures can be made by transferring
-a little of the growing colony to a new dish of sterilized agar,
-gelatin or other material suited to germ life. From these pure cultures
-fresh milk from the Station herd was inoculated and small Neufchatel
-cheeses made. No bitter flavor was noticed in similar check cheeses;
-and the milk containing only one of the forms of germ life found
-produced bitter cheese. The bitterness, as in the factory, was noticed
-only after the curd was drained and ærated. Soft, poorly-drained curd
-was free from the flavor though well inoculated with the short bacillus
-which produced the bad flavor in well-dried curd. This shows that the
-germ is one which requires exposure to the air to develop the bitter
-compound in the cheese. Unfortunately this germ, when cultivated in
-milk for some time lost the power of producing bitter cheese, so the
-investigation came to an end.
-
-
-SWEET FLAVOR IN CHEDDAR CHEESE.
-
-[Sidenote: =A new cause of cheese faults.=]
-
-By methods similar to those just given the cause of the common and
-costly cheese fault known as “sweet flavor” has probably been found.
-This investigation was demanded by the occurrence in some of the
-best-conducted factories of outbreaks of the trouble which most
-thorough cleansing and scalding fail to overcome. It is believed that
-these attacks result in annual loss to the State of at least $10,000.
-The trouble is of obscure origin and is peculiar in its development,
-manifesting itself in flavors of varying intensity and character, from
-a faint sweetness to a well-marked fruity smell and taste, and seeming
-to appear and disappear without rule or method. This made study more
-difficult than in the case of well-defined troubles; but its manner of
-development in the cheese indicated some living germ as the cause; so
-the attempt at solution of the problem was made from that standpoint.
-
-By cultural methods, study was made of the flora of good and poor
-cheeses; that is, the various forms of plant life existing in these
-cheeses were separated from each other and their forms, actions and
-effects noted. These forms of life were mostly bacteria and yeasts;
-and, contrary to the usual rule, it was the latter which finally seemed
-to demand attention.
-
-Yeasts are plants a little higher in the scale of life than bacteria,
-a little larger but still microscopic, and differing from bacteria in
-their mode of reproduction, which is by budding of a new cell from
-an old one rather than by division of an old cell into two new ones
-of equal size. Their most characteristic action is the formation of
-alcohol and carbon dioxide; which makes them indispensable in brewing
-and bread making.
-
-In good cheeses almost no yeasts were found, but in the sweet-flavored
-cheeses sometimes half of the germs present were yeasts; and they were
-always found where the sweet flavor was noticed. Yeasts have not been
-recognized, hitherto, as a cause for such cheese faults; but their
-presence in such numbers cast strong suspicion upon them; which actual
-work proved to be well founded, for pronounced cases of sweet flavor
-developed in cheeses made from pure milk inoculated with the yeasts;
-and the vat in which the cheese was made became contaminated so that,
-without further intentional inoculation, sweet-flavored cheese was
-produced where none had been known before. As yeasts have hitherto
-played minor parts in dairy investigations, no classification of those
-found has yet been made, nor has the exact flavor due to each one been
-determined. Further study is being given to the subject.
-
-
-RUSTY SPOT IN CHEDDAR CHEESE.
-
-[Sidenote: =Not a flavor.=]
-
-Rusty spot is not a flavor trouble, as spotted cheeses of this kind
-may be all right in taste and smell. The spots, however, are offensive
-to the eye and render the cheese salable only at a reduction in price,
-if at all. From the Station investigations, continued for nearly two
-years, along much the same lines as the flavor studies but with a
-little more definite guide in color than in taste and smell, some
-direct knowledge has been gained, though not as definite as could be
-desired along preventive and remedial lines.
-
-[Sidenote: =Cause and conditions.=]
-
-The rusty spots are colonies of minute plants, bacteria, growing on
-the walls of the air spaces within the cheese. The trouble usually
-appears in May, often does little harm during the middle of the summer
-and generally disappears in October. In cheese made with a high acid
-content the moisture content of the air spaces within the cheese is
-low, and without abundance of moisture the germs make little growth;
-hence the spots are too small to be noticed. The marked influence, on
-the germs of rusty spot, of this slight variation in the character
-of the cheese probably accounts for the unexpected appearance and
-disappearance of the spots from cheeses of an occasional day’s make in
-infected factories.
-
-[Sidenote: =Cure.=]
-
-Where the spots are not too large or too plentiful, giving the cheese a
-good high color covers up the rustiness so that it is not noticeable.
-To get entirely rid of the trouble has bothered some of the best
-cheese-makers, aided by good advisers; but plenty of hot water followed
-by a liberal use of live steam on vats, cans and working utensils
-should give good results.
-
-
-
-
-FOOTNOTES:
-
-
-[A] Connected with Fertilizer Control.
-
-[B] At Second Judicial Department Branch Station, Jamaica, N. Y.
-
-[C] Absent on leave.
-
-[D] This is a brief review of Bulletin No. 183 of this Station entitled
-Notes on Some Dairy Troubles, by H. A. Harding, L. A. Rogers and G.
-A. Smith. Anyone specially interested in the detailed account of the
-investigations will be furnished, on application, with a copy of the
-complete bulletin. The names of those who so request will be placed
-on the Station mailing list to receive future bulletins, popular or
-complete as desired. Bulletins are issued at irregular intervals as
-investigations are completed, not monthly.
-
-
-
-
-TRANSCRIBER’S NOTES:
-
-
-Italicized text is surrounded by underscores: _italics_.
-
-Emboldened text is surrounded by equals signs: =bold=.
-
-*** END OF THE PROJECT GUTENBERG EBOOK DAIRY DISAGREEABLES BUSY THE
-BACTERIOLOGISTS ***
-
-Updated editions will replace the previous one--the old editions will
-be renamed.
-
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-<body>
-<p style='text-align:center; font-size:1.2em; font-weight:bold'>The Project Gutenberg eBook of Dairy Disagreeables Busy the Bacteriologists, by F. H. Hall</p>
-<div style='display:block; margin:1em 0'>
-This eBook is for the use of anyone anywhere in the United States and
-most other parts of the world at no cost and with almost no restrictions
-whatsoever. You may copy it, give it away or re-use it under the terms
-of the Project Gutenberg License included with this eBook or online
-at <a href="https://www.gutenberg.org">www.gutenberg.org</a>. If you
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-country where you are located before using this eBook.
-</div>
-
-<p style='display:block; margin-top:1em; margin-bottom:1em; margin-left:2em; text-indent:-2em'>Title: Dairy Disagreeables Busy the Bacteriologists</p>
-<p style='display:block; margin-top:1em; margin-bottom:0; margin-left:2em; text-indent:-2em'>Authors: F. H. Hall</p>
-<p style='display:block; margin-top:0; margin-bottom:0; margin-left:2em;'>H. A. Harding</p>
-<p style='display:block; margin-top:0; margin-bottom:0; margin-left:2em;'>L. A. Rogers</p>
-<p style='display:block; margin-top:0; margin-bottom:0; margin-left:2em;'>G. A. Smith</p>
-<p style='display:block; text-indent:0; margin:1em 0'>Release Date: January 9, 2022 [eBook #67134]</p>
-<p style='display:block; text-indent:0; margin:1em 0'>Language: English</p>
- <p style='display:block; margin-top:1em; margin-bottom:0; margin-left:2em; text-indent:-2em; text-align:left'>Produced by: Charlene Taylor, David E. Brown, and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive)</p>
-<div style='margin-top:2em; margin-bottom:4em'>*** START OF THE PROJECT GUTENBERG EBOOK DAIRY DISAGREEABLES BUSY THE BACTERIOLOGISTS ***</div>
-
-<div class="figcenter"><img src="images/cover.jpg" width="40%" alt="" /></div>
-
-<hr class="chap x-ebookmaker-drop" />
-
-<div class="figcenter"><img src="images/title.jpg" alt="" /></div>
-
-<hr class="chap x-ebookmaker-drop" />
-
-
-<div class="titlepage">
-
-<p>POPULAR EDITION.</p>
-<hr class="tiny" />
-<p>BULLETIN No. 183. <span class="gap"> DECEMBER, 1900.</span></p>
-
-<hr class="tb" />
-<p><span class="xlarge"><span class="antiqua">New York Agricultural Experiment Station.</span></span></p>
-
-<p>GENEVA, N. Y.</p>
-
-<div class="figcenter"><img src="images/titleillo.jpg" alt="" /></div>
-
-<h1>DAIRY DISAGREEABLES BUSY THE BACTERIOLOGISTS.</h1>
-<hr class="tb" />
-<p>F. H. HALL, H. A. HARDING, L. A. ROGERS AND G. A. SMITH.</p>
-<hr class="tb" />
-<p>PUBLISHED BY THE STATION.</p>
-</div>
-
-<hr class="chap x-ebookmaker-drop" />
-
-<div class="chapter">
-<p class="ph1">BOARD OF CONTROL.</p>
-</div>
-
-
-<div class="poetry-container">
-<div class="poetry">
-<p><span class="smcap">Governor Theodore Roosevelt</span>, Albany.<br />
-<span class="smcap">Stephen H. Hammond</span>, Geneva.<br />
-<span class="smcap">Austin C. Chase</span>, Syracuse.<br />
-<span class="smcap">Frank O. Chamberlain</span>, Canandaigua.<br />
-<span class="smcap">Frederick C. Schraub</span>, Lowville.<br />
-<span class="smcap">Nicholas Hallock</span>, Queens.<br />
-<span class="smcap">Lyman P. Haviland</span>, Camden.<br />
-<span class="smcap">Edgar G. Dusenbury</span>, Portville.<br />
-<span class="smcap">Oscar H. Hale</span>, North Stockholm.<br />
-<span class="smcap">Martin L. Allen</span>, Fayette.</p>
-</div></div>
-
-<p class="ph1">OFFICERS OF THE BOARD.</p>
-
-<p class="center"><span class="smcap">Stephen H. Hammond</span>, <i>President</i>.<span class="gap"><span class="smcap">William O&#8217;Hanlon</span>, <i>Secretary and Treasurer</i>.</span></p>
-
-
-<p class="ph1">EXECUTIVE COMMITTEE.</p>
-
-<table border="0" cellpadding="2" cellspacing="2" summary="table">
-<tr><td><span class="smcap">Stephen H. Hammond</span>,</td><td> <span class="smcap">Frederick C. Schraub</span>,</td></tr>
-<tr><td><span class="smcap">Martin L. Allen</span>,</td><td> <span class="smcap">Lyman P. Haviland</span>,</td></tr>
-<tr><td><span class="smcap">Frank O. Chamberlain</span>, &nbsp; &nbsp; </td><td> <span class="smcap">Nicholas Hallock</span>.</td></tr>
-</table>
-
-<p class="ph1">STATION STAFF.</p>
-
-<table border="0" cellpadding="2" cellspacing="2" summary="table">
-
-
-<tr><td class="tdc" colspan="2" ><span class="smcap">Whitman H. Jordan, Sc. D.</span>, <i>Director</i>.</td></tr>
-
-<tr><td><span class="smcap">George W. Churchill</span>,</td><td> <span class="smcap">Harry A. Harding</span>, M.S.,</td></tr>
-<tr><td class="tdr"> <i>Agriculturist and Superintendent of Labor</i>. &nbsp; &nbsp; &nbsp; </td><td class="tdr"> <i>Dairy Bacteriologist</i>.</td></tr>
-
-<tr><td><span class="smcap">William P. Wheeler</span>,</td><td> <span class="smcap">Lore A. Rogers</span>, B.S.,</td></tr>
-<tr><td class="tdr"> <i>First Assistant</i> (<i>Animal Industry</i>). &nbsp; &nbsp; &nbsp; </td><td class="tdr"> <i>Assistant Bacteriologist</i>.</td></tr>
-
-<tr><td><span class="smcap">Fred C. Stewart</span>, M.S.,</td><td> <span class="smcap">George A. Smith</span>,</td></tr>
-<tr><td class="tdr"> <i>Botanist</i>. &nbsp; &nbsp; &nbsp; </td><td class="tdr"> <i>Dairy Expert</i>.</td></tr>
-
-<tr><td><span class="smcap">Lucius L. VanSlyke, Ph.D.</span>,</td><td> <span class="smcap">Frank H. Hall</span>, B.S.,</td></tr>
-<tr><td class="tdr"> <i>Chemist</i>. &nbsp; &nbsp; &nbsp; </td><td class="tdr"> <i>Editor and Librarian</i>.</td></tr>
-
-<tr><td><span class="smcap">Christian G. Jenter, Ph.C.,</span></td><td><span class="smcap">Victor H. Lowe</span>, M.S.,</td></tr>
-<tr><td><span class="smcap">William H. Andrews</span>, B.S.,<a id="FNanchor_1" href="#Footnote_1" class="fnanchor">[A]</a></td><td><span class="smcap">F. Atwood Sirrine</span>, M.S.,<a id="FNanchor_3" href="#Footnote_3" class="fnanchor">[C]</a></td></tr>
-<tr><td><span class="smcap">J. Arthur LeClerc</span>, B.S.,</td><td class="tdr"> <i>Entomologists</i>.</td></tr>
-<tr><td><span class="smcap">Amasa D. Cook, Ph.C.,<a id="FNanchor_2" href="#Footnote_2" class="fnanchor">[B]</a></span></td><td><span class="smcap">Percival J. Parrott</span>, A.M.,</td></tr>
-<tr><td><span class="smcap">Frederick D. Fuller</span>, B.S.,</td><td class="tdr"> <i>Assistant Entomologist</i>.</td></tr>
-<tr><td><span class="smcap">Edwin B. Hart</span>, B.S.,<a id="FNanchor_2a" href="#Footnote_2" class="fnanchor">[B]</a></td><td><span class="smcap">Spencer A. Beach</span>, M.S.,</td></tr>
-<tr><td><span class="smcap">Charles W. Mudge</span>, B.S.,<a id="FNanchor_1a" href="#Footnote_1" class="fnanchor">[A]</a></td><td class="tdr"><i>Horticulturist</i>.</td></tr>
-<tr><td><span class="smcap">Andrew J. Patten</span>, B.S.,<a id="FNanchor_1b" href="#Footnote_1" class="fnanchor">[A]</a></td><td><span class="smcap">Heinrich Hasselbring</span>, B.S.A., &nbsp; &nbsp; &nbsp; </td></tr>
-<tr><td class="tdr"><i>Assistant Chemists</i>. &nbsp; &nbsp; &nbsp; </td><td class="tdr"><i>Assistant Horticulturist</i>.</td></tr>
- <tr><td>&nbsp;</td><td><span class="smcap">Frank E. Newton</span>,</td></tr>
- <tr><td>&nbsp;</td><td><span class="smcap">Jennie Terwilliger</span>,</td></tr>
- <tr><td>&nbsp;</td><td class="tdr"> <i>Clerks and Stenographers</i>.</td></tr>
- <tr><td>&nbsp;</td><td> <span class="smcap">Adin H. Horton</span>,</td></tr>
- <tr><td>&nbsp;</td><td class="tdr"> <i>Computer</i>.</td></tr>
-
-
-
-
-
-</table>
-
-<p>Address all correspondence, not to individual members of the staff, but
-to the <span class="smcap">New York Agricultural Experiment Station, Geneva, N. Y.</span></p>
-
-<p>The Bulletins published by the Station will be sent free to any farmer
-applying for them.</p>
-
-
-<hr class="chap x-ebookmaker-drop" />
-
-<div class="chapter">
-<span class="pagenum" id="Page_3">[3]</span>
-<p class="ph1"><span class="smcap">Popular Edition</span><a id="FNanchor_4" href="#Footnote_4" class="fnanchor">[D]</a><br />
-
-<span class="allsmcap">OF</span><br />
-
-<span class="smcap">Bulletin No. 183</span>.<br />
-<br />
-<span class="large">DAIRY DISAGREEABLES BUSY THE BACTERIOLOGISTS.</span><br />
-<br />
-F. H. HALL.</p>
-</div>
-
-<h2><span class="smcap">Flavor in Milk and Its Products.</span></h2>
-
-<div class="sidenote"><b>Flavor:<br />
-How tested?</b></div>
-
-<p>Good flavor sells milk, cream, butter and cheese;
-poor flavor condemns them. Flavor is that indescribable
-something, which, in good dairy products,
-appeals pleasantly to our senses, but often
-passes unnoticed because so familiar; in poor products it is
-equally indescribable, but more often characterized in vigorous
-language, when &#8220;frowzy&#8221; butter, &#8220;garlicy&#8221; milk, &#8220;bitter&#8221;
-cream or &#8220;strong&#8221; cheese present their offensive odors and tastes.
-The ordinary consumer calls flavor the &#8220;taste&#8221; of the article
-which tickles his palate; but the expert knows that the nerves of
-smell play the larger part, and he depends for his judgment largely
-upon a trained nose. Hence we see the butter judge or cheese
-scorer pass the trier beneath his nostrils with deep-drawn breath
-and meditative study of the aroma which arises. Smells, however,
-cannot be measured in degrees or separated into their elements
-by the spectroscope; therefore we have to depend upon
-general terms, often differing with the different experts, in our discussion
-of flavor; yet we have some well-marked classes which
-serve as a basis for reference.</p>
-
-<p><span class="pagenum" id="Page_4">[4]</span></p>
-
-<div class="sidenote"><b>Faults of<br />
-flavor<br />
-classified.</b></div>
-
-<p>We can separate the faulty flavors into classes by
-their origin. The minute particles thrown off by
-dairy products, whose impact upon tongue or nostrils
-give rise to taste or smell, may come (1) from
-compounds in the food of the cow or developed in
-her body (2) from matters, other than germs, taken up by the
-milk while it stands in poorly-ventilated stables or rooms reeking
-with foul smells, or (3) from substances which are the direct or
-indirect result of the activity of living organisms in the milk.</p>
-
-<p>Odors of the first class will be most noticeable while the milk is
-warm from the cow and will not increase with time. They are
-really far less common than dairymen generally believe and may
-be avoided almost entirely by careful feeding. Garlic, turnips,
-cabbage and such &#8220;fragrant&#8221; edibles will, of course, taint the
-milk if they are fed within a few hours before milking; but when
-fed soon after the cows are milked, the volatile oils to which these
-odors are due will generally disappear from the animal&#8217;s system
-before the next morning or evening.</p>
-
-<p>Too often odors of the second class are assigned to the first, and
-the old cow takes the blame for man&#8217;s fault; as milk very readily
-and quickly takes up smells and tastes from its surroundings.
-When the owner delivers milk to the factory and is told that it
-&#8220;smells bad,&#8221; he forgets that he or his men let it stand in the
-uncleaned stable to draw in the &#8220;cowy&#8221; and worse odors, while
-the cows were being fed and some other chores attended to; or
-that they poured it into pails that lacked a little of perfect sweetness;
-and he immediately says; &#8220;I&#8217;ve got to stop feeding silage.&#8221;
-&#8220;The cows ate some cabbage trimmings last night,&#8221; or, &#8220;Someone
-forgot to close the rye-field gate.&#8221;</p>
-
-<p>Odors of these two classes, due to volatile compounds in the
-milk, are of most importance in the milk and cream trade, as the
-faults largely disappear in making butter and cheese. Thorough
-&aelig;ration is often helpful in the removal of such flavors.</p>
-
-<p>Odors of the third class, except in some very rare cases where
-the udder itself is the seat of colonies of bacteria, are not observed
-in freshly-drawn milk. The bacteria, molds and yeasts which
-cause them must have a chance to develop and to set up chemical
-changes in the milk; and this rarely occurs to any great extent<span class="pagenum" id="Page_5">[5]</span>
-within 12 hours from the time the milk is drawn. A high temperature,
-however, is favorable to growth of these low forms of
-plant life; so in warm weather milk faults are common. In
-butter-making, and in cheese-making, also, the heat often used to
-ripen the cream and the high temperature at which the milk is
-held in &#8220;setting&#8221; and &#8220;cooking&#8221; the curd, furnish conditions
-very favorable to the germs present and they develop with great
-rapidity. In their growth part of the milk is used for food and in
-its breaking down into simpler compounds the aromatic substances
-which make flavor, good or bad, are formed.</p>
-
-<p>The flavor of good milk and cream, then, is an inherent quality
-due to the normal constituents of the milk; the flavors of butter,
-both good and bad, except that due to the fat and to odors
-absorbed by the milk, are held to be the result of bacterial action;
-the fundamental flavors of cheese are probably due to chemical
-decomposition, started by unorganized ferments known as enzyms;
-joined with which are other flavors marking the individual
-cheeses, which are probably due to bacteria; and it has recently
-been found that in some cases yeasts have been the cause of bad
-flavor.</p>
-
-
-<h2><span class="smcap">Fishy Flavor in Milk.</span></h2>
-
-<div class="sidenote"><b>Ready<br />
-Relief.</b></div>
-
-<p>This peculiar smell, as though the milk had set in
-a close room with a barrel of not-too-fresh fish,
-was brought to the attention of the Bacteriologist
-by a dealer who had already located it as coming
-from the milk of a certain dairy. The dairyman is a more than
-ordinarily careful milk-handler, who gladly co&ouml;perated with the
-Station in efforts to locate the trouble in his herd. Bottles were
-supplied by the Bacteriologist, which had been steamed to insure
-the death of all germ life and then sealed. These sealed bottles
-were taken by the dairyman to his farm; at milking time each
-was opened long enough to receive a little milk from each quarter
-of the udder of a single cow; and then re-sealed. All were
-brought to the Station; and, upon examination, the odor was
-found only in the milk of one cow. The owner rejected her milk
-and heard no further complaint, from the dealer, of bad smells.
-This was the practical point; and it was thus easily and simply
-gained.</p>
-
-<p><span class="pagenum" id="Page_6">[6]</span></p>
-
-<div class="sidenote"><b>Cause not<br />
-found.</b></div>
-
-<p>From the scientist&#8217;s standpoint, though, only a
-beginning had been made; the real cause of the
-trouble was as yet unknown; nor was any satisfactory
-solution reached even after a long investigation.
-The flavor could hardly come from the food, for all the
-cows were fed alike and no objectionable weeds were found in
-their pasture. The cow seemed perfectly healthy and no evidence
-of inflammation or disease could be found on the udder or in the
-milk. Neither could any form of bacteria be found in the milk,
-which, in cultures or introduced into the udder of a healthy cow,
-would reproduce the fishy smell.</p>
-
-<div class="sidenote"><b>Rare fault.</b></div>
-
-<p>At least two other cases of similar flavor have
-been known; but no cause was evident in either
-case. The trouble is very infrequent, at worst,
-and is here discussed mainly to show how easily a trouble due to
-one cow can be located by taking individual samples of the milk;
-and how cheaply gotten rid of by leaving out the objectionable
-product.</p>
-
-
-<h2><span class="smcap">Bitter Flavor in Neufchatel Cheese.</span></h2>
-
-<div class="sidenote"><b>An uncompleted<br />
-study.</b></div>
-
-<p>A little better result than that in the study of fishy
-flavor was reached in the investigation of a bitter
-flavor in Neufchatel cheese; but this study also
-had to be left incomplete. The trouble in the
-factory was easily remedied; and the germ responsible for the outbreak
-was obtained in pure culture; but full study of the fault in
-all its bearings was hindered by the refusal of the herd owner to
-admit that the trouble was due to his milk. The investigation
-had to stop with the guilty herd; it did not locate the original
-source of infection.</p>
-
-<div class="sidenote"><b>Method of<br />
-detection.</b></div>
-
-<p>This bitter flavor is not the same as the bitterness
-quite common in milk and cream at certain seasons of
-the year; as the milk itself tasted and smelled all
-right until well along in the process of cheese-making
-when the curd was being &aelig;rated and drained. The flavor
-was noticed in the factory in October and could not be checked,
-though the maker took great pains to wash and scald all his utensils
-and everything which touched the milk after it came from the
-farm. To locate the trouble, samples were taken of the milk of<span class="pagenum" id="Page_7">[7]</span>
-each patron and the cheese-making process started with each
-sample. In 18 hours all the samples of curd appeared normal
-but two, which were gassy and bad-smelling; and one of these,
-when drained and exposed to the air, showed a pronounced bitter
-flavor. This sample proved to be from the dairy which had furnished
-the milk for making the Neufchatel, a milk specially
-selected because of its high fat-content. This furnished direct
-proof that the fault lay in the milk, not in its factory handling;
-and rejection of this milk ended the trouble in the Neufchatel.
-As already stated, the study could not be carried into the herd to
-see whether one cow, wrong stable surroundings, a stagnant pool
-of water or contaminated dairy utensils were to blame for the
-trouble in the factory.</p>
-
-<div class="sidenote"><b>Bacteria<br />
-blamable.</b></div>
-
-<p>Samples of this faulty milk were taken for laboratory
-study and various bacteria and molds were
-separated. This was done by diluting the milk
-with a sterilized fluid so that the germs were
-quite widely separated when the milk was poured out in flat glass
-dishes. Each kind of germ is marked by some peculiarity of
-growth which makes it possible to distinguish between them; and
-pure cultures can be made by transferring a little of the growing
-colony to a new dish of sterilized agar, gelatin or other material
-suited to germ life. From these pure cultures fresh milk from the
-Station herd was inoculated and small Neufchatel cheeses made.
-No bitter flavor was noticed in similar check cheeses; and the
-milk containing only one of the forms of germ life found produced
-bitter cheese. The bitterness, as in the factory, was noticed only
-after the curd was drained and &aelig;rated. Soft, poorly-drained curd
-was free from the flavor though well inoculated with the short
-bacillus which produced the bad flavor in well-dried curd. This
-shows that the germ is one which requires exposure to the air to
-develop the bitter compound in the cheese. Unfortunately this
-germ, when cultivated in milk for some time lost the power of
-producing bitter cheese, so the investigation came to an end.</p>
-
-<p><span class="pagenum" id="Page_8">[8]</span></p>
-
-
-<h2><span class="smcap">Sweet Flavor in Cheddar Cheese.</span></h2>
-
-<div class="sidenote"><b>A new cause<br />
-of cheese<br />
-faults.</b></div>
-
-<p>By methods similar to those just given the cause
-of the common and costly cheese fault known as
-&#8220;sweet flavor&#8221; has probably been found. This
-investigation was demanded by the occurrence in
-some of the best-conducted factories of outbreaks
-of the trouble which most thorough cleansing and scalding fail to
-overcome. It is believed that these attacks result in annual loss
-to the State of at least $10,000. The trouble is of obscure origin
-and is peculiar in its development, manifesting itself in flavors of
-varying intensity and character, from a faint sweetness to a well-marked
-fruity smell and taste, and seeming to appear and disappear
-without rule or method. This made study more difficult than
-in the case of well-defined troubles; but its manner of development
-in the cheese indicated some living germ as the cause; so the attempt
-at solution of the problem was made from that standpoint.</p>
-
-<p>By cultural methods, study was made of the flora of good and
-poor cheeses; that is, the various forms of plant life existing in
-these cheeses were separated from each other and their forms, actions
-and effects noted. These forms of life were mostly bacteria
-and yeasts; and, contrary to the usual rule, it was the latter
-which finally seemed to demand attention.</p>
-
-<p>Yeasts are plants a little higher in the scale of life than
-bacteria, a little larger but still microscopic, and differing from
-bacteria in their mode of reproduction, which is by budding of a
-new cell from an old one rather than by division of an old cell into
-two new ones of equal size. Their most characteristic action is
-the formation of alcohol and carbon dioxide; which makes them
-indispensable in brewing and bread making.</p>
-
-<p>In good cheeses almost no yeasts were found, but in the sweet-flavored
-cheeses sometimes half of the germs present were yeasts;
-and they were always found where the sweet flavor was noticed.
-Yeasts have not been recognized, hitherto, as a cause for such
-cheese faults; but their presence in such numbers cast strong
-suspicion upon them; which actual work proved to be well
-founded, for pronounced cases of sweet flavor developed in cheeses
-made from pure milk inoculated with the yeasts; and the vat in
-which the cheese was made became contaminated so that, without<span class="pagenum" id="Page_9">[9]</span>
-further intentional inoculation, sweet-flavored cheese was produced
-where none had been known before. As yeasts have
-hitherto played minor parts in dairy investigations, no classification
-of those found has yet been made, nor has the exact flavor due
-to each one been determined. Further study is being given to
-the subject.</p>
-
-
-<h2><span class="smcap">Rusty Spot in Cheddar Cheese.</span></h2>
-
-<div class="sidenote"><b>Not a flavor.</b></div>
-
-<p>Rusty spot is not a flavor trouble, as spotted
-cheeses of this kind may be all right in taste and
-smell. The spots, however, are offensive to the
-eye and render the cheese salable only at a reduction in price, if
-at all. From the Station investigations, continued for nearly two
-years, along much the same lines as the flavor studies but with a
-little more definite guide in color than in taste and smell, some
-direct knowledge has been gained, though not as definite as could
-be desired along preventive and remedial lines.</p>
-
-<div class="sidenote"><b>Cause and<br />
-conditions.</b></div>
-
-<p>The rusty spots are colonies of minute plants,
-bacteria, growing on the walls of the air spaces
-within the cheese. The trouble usually appears
-in May, often does little harm during the middle
-of the summer and generally disappears in October. In cheese
-made with a high acid content the moisture content of the air
-spaces within the cheese is low, and without abundance of moisture
-the germs make little growth; hence the spots are too small
-to be noticed. The marked influence, on the germs of rusty spot,
-of this slight variation in the character of the cheese probably
-accounts for the unexpected appearance and disappearance of
-the spots from cheeses of an occasional day&#8217;s make in infected
-factories.</p>
-
-<div class="sidenote"><b>Cure.</b></div>
-
-<p>Where the spots are not too large or too plentiful,
-giving the cheese a good high color covers up the
-rustiness so that it is not noticeable. To get
-entirely rid of the trouble has bothered some of the best cheese-makers,
-aided by good advisers; but plenty of hot water followed
-by a liberal use of live steam on vats, cans and working utensils
-should give good results.</p>
-
-
-<hr class="chap x-ebookmaker-drop" />
-
-<div class="chapter">
-<p class="ph1">FOOTNOTES:</p>
-
-
-<div class="footnote">
-
-<p><a id="Footnote_1" href="#FNanchor_1" class="label">[A]</a> Connected with Fertilizer Control.</p>
-
-</div>
-
-<div class="footnote">
-
-<p><a id="Footnote_2" href="#FNanchor_2" class="label">[B]</a> At Second Judicial Department Branch Station, Jamaica, N. Y.</p>
-
-</div>
-
-<div class="footnote">
-
-<p><a id="Footnote_3" href="#FNanchor_3" class="label">[C]</a> Absent on leave.</p>
-
-</div>
-
-<div class="footnote">
-
-<p><a id="Footnote_4" href="#FNanchor_4" class="label">[D]</a> This is a brief review of Bulletin No. 183 of this Station entitled Notes
-on Some Dairy Troubles, by H. A. Harding, L. A. Rogers and G. A. Smith.
-Anyone specially interested in the detailed account of the investigations
-will be furnished, on application, with a copy of the complete bulletin.
-The names of those who so request will be placed on the Station mailing
-list to receive future bulletins, popular or complete as desired. Bulletins
-are issued at irregular intervals as investigations are completed, not monthly.</p>
-
-</div>
-</div>
-
-<hr class="chap x-ebookmaker-drop" />
-
-<div class="chapter">
-<div class="transnote">
-<p class="ph1">TRANSCRIBER&#8217;S NOTE:</p>
-
-
-
-<p>The cover image for this eBook was created by the transcriber and is entered into the public domain.</p>
-</div></div>
-
-
-<div style='display:block; margin-top:4em'>*** END OF THE PROJECT GUTENBERG EBOOK DAIRY DISAGREEABLES BUSY THE BACTERIOLOGISTS ***</div>
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