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+The Project Gutenberg EBook of Time and Life: Mr. Darwin's “Origin of Species”, by Thomas H. Huxley
+
+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'll have
+to check the laws of the country where you are located before using this ebook.
+
+Title: Time and Life: Mr. Darwin's “Origin of Species”
+
+Author: Thomas H. Huxley
+
+Release Date: November, 2001 [EBook #2928]
+[Most recently updated: November 19, 2020]
+
+Language: English
+
+Character set encoding: UTF-8
+
+*** START OF THIS PROJECT GUTENBERG EBOOK TIME AND LIFE: MR. DARWIN'S “ORIGIN OF SPECIES” ***
+
+
+
+
+Produced by Amy E. Zelmer.
+
+
+
+
+Time and Life*
+
+MR. DARWIN’S “ORIGIN OF SPECIES”
+
+by Thomas H. Huxley
+
+
+
+
+Everyone knows that that superficial film of the earth’s substance,
+hardly ten miles thick, which is accessible to human investigation, is
+composed for the most part of beds or strata of stone, the consolidated
+muds and sands of former seas and lakes, which have been deposited one
+upon the other, and hence are the older the deeper they lie. These
+multitudinous strata present such resemblances and differences among
+themselves that they are capable of classification into groups or
+formations, and these formations again are brigaded together into still
+larger assemblages, called by the older geologists, primary, secondary,
+and tertiary; by the moderns, palaeozoic, mesozoic, and cainozoic: the
+basis of the former nomenclature being the relative age of the groups
+of strata; that of the latter, the kinds of living forms contained in
+them.
+
+Though but a film if compared with the total diameter of our planet,
+the total series of formations is vast indeed when measured by any
+human standard, and, as all action implies time, so are we compelled to
+regard these mineral masses as a measure of the time which has elapsed
+during their accumulation. The amount of the time which they represent
+is, of course, in the inverse proportion of the intensity of the forces
+which have been in operation. If, in the ancient world, mud and sand
+accumulated on sea-bottoms at tenfold their present rate, it is clear
+that a bed of mud or sand ten feet thick would have been formed then in
+the same time as a stratum of similar materials one foot thick would be
+formed now, and _vice versa_.
+
+At the outset of his studies, therefore, the physical geologist had to
+choose between two hypotheses; either, throughout the ages which are
+represented by the accumulated strata, and which we may call _geologic
+time_, the forces of nature have operated with much the same average
+intensity as at present, and hence the lapse of time which they
+represent must be something prodigious and inconceivable, or, in the
+primeval epochs, the natural powers were infinitely more intense than
+now, and hence the time through which they acted to produce the effects
+we see was comparatively short.
+
+The earlier geologists adopted the latter view almost with one consent.
+For they had little knowledge of the present workings of nature, and
+they read the records of geologic time as a child reads the history of
+Rome or Greece, and fancies that antiquity was grand, heroic, and
+unlike the present because it is unlike his little experience of the
+present.
+
+Even so the earlier observers were moved with wonder at the seeming
+contrast between the ancient and the present order of nature. The
+elemental forces seemed to have been grander and more energetic in
+primeval times. Upheaved and contorted, rifted and fissured, pierced by
+dykes of molten matter or worn away over vast areas by aqueous action,
+the older rocks appeared to bear witness to a state of things far
+different from that exhibited by the peaceful epoch on which the lot of
+man has fallen.
+
+But by degrees thoughtful students of geology have been led to perceive
+that the earliest efforts of nature have been by no means the grandest.
+Alps and Andes are children of yesterday when compared with Snowdon and
+the Cumberland hills; and the so-called glacial epoch—that in which
+perhaps the most extensive physical changes of which any record
+remaining occurred—is the last and the newest of the revolutions of the
+globe. And in proportion as physical geography—which is the geology of
+our own epoch—has grown into a science, and the present order of nature
+has been ransacked to find what, _hibernice_, we may call precedents
+for the phenomena of the past, so the apparent necessity of supposing
+the past to be widely different from the present has diminished.
+
+The transporting power of the greatest deluge which can be imagined
+sinks into insignificance beside that of the slowly floating, slowly
+melting iceberg, or the glacier creeping along at its snail’s pace of a
+yard a day. The study of the deltas of the Nile, the Ganges, and the
+Mississippi has taught us how slow is the wearing action of water, how
+vast its effects when time is allowed for its operation. The reefs of
+the Pacific, the deep-sea soundings of the Atlantic, show that it is to
+the slow-growing coral and to the imperceptible animalcule, which lives
+its brief space and then adds its tiny shell to the muddy cairn left by
+its brethren and ancestors, that we must look as the agents in the
+formation of limestone and chalk, and not to hypothetical oceans
+saturated with calcareous salts and suddenly depositing them.
+
+And while the inquirer has thus learnt that existing forces—_give them
+time_—are competent to produce all the physical phenomena we meet with
+in the rocks, so, on the other side, the study of the marks left in the
+ancient strata by past physical actions shows that these were similar
+to those which now obtain. Ancient beaches are met with whose pebbles
+are like those found on modern shores; the hardened sea-sands of the
+oldest epochs show ripple-marks, such as may now be found on every
+sandy coast; nay, more, the pits left by ancient rain-drops prove that
+even in the very earliest ages, the “bow in the clouds” must have
+adorned the palaeozoic firmament. So that if we could reverse the
+legend of the Seven Sleepers,—if we could sleep back through the past,
+and awake a million ages before our own epoch, in the midst of the
+earliest geologic times,—there is no reason to believe that sea, or
+sky, or the aspect of the land would warn us of the marvellous
+retrospection.
+
+Such are the beliefs which modern physical geologists hold, or, at any
+rate, tend towards holding. But, in so doing, it is obvious that they
+by no means prejudge the question, as to what the physical condition of
+the globe may have been before our chapters of its history begin, in
+what may be called (with that licence which is implied in the
+often-used term “prehistoric epoch”) “pre-geologic time.” The views
+indicated, in fact, are not only quite consistent with the hypothesis,
+that, in the still earlier period referred to, the condition of our
+world was very different; but they may be held by some to necessitate
+that hypothesis. The physical philosopher who is accurately acquainted
+with the velocity of a cannon-ball, and the precise character of the
+line which it traverses for a yard of its course, is necessitated by
+what he knows of the laws of nature to conclude that it came from a
+certain spot, whence it was impelled by a certain force, and that it
+has followed a certain trajectory. In like manner, the student of
+physical geology, who fully believes in the uniformity of the general
+condition of the earth through geologic time, may feel compelled by
+what he knows of causation, and by the general analogy of nature, to
+suppose that our solar system was once a nebulous mass; that it
+gradually condensed, that it broke up into that wonderful group of
+harmoniously rolling balls we call planets and satellites, and that
+then each of these underwent its appointed metamorphosis, until at last
+our own share of the cosmic vapour passed into that condition in which
+we first meet with definite records of its state, and in which it has
+since, with comparatively little change, remained.
+
+The doctrine of uniformity and the doctrine of progression are,
+therefore, perfectly consistent; perhaps, indeed, they might be shown
+to be necessarily connected with one another.
+
+If, however, the condition of the world, which has obtained throughout
+geologic time, is but the sequel to a vast series of changes which took
+place in pre-geologic time, then it seems not unlikely that the
+duration of this latter is to that of the former as the vast extent of
+geologic time is to the length of the brief epoch we call the
+historical period; and that even the oldest rocks are records of an
+epoch almost infinitely remote from that which could have witnessed the
+first shaping of our globe.
+
+It is probable that no modern geologist would hesitate to admit the
+general validity of these reasonings when applied to the physics of his
+subject, whence it is the more remarkable that the moment the question
+changes from one of physics and chemistry to one of natural history,
+scientific opinions and the popular prejudices, which reflect them in a
+distorted form, undergo a sudden metamorphosis. Geologists and
+palaeontologists write about the “beginning of life” and the
+“first-created forms of living beings,” as if they were the most
+familiar things in the world; and even cautious writers seem to be on
+quite friendly terms with the “archetype” whereby the Creator was
+guided “amidst the crash of falling worlds.” Just as it used to be
+imagined that the ancient world was physically opposed to the present,
+so it is still widely assumed that the living population of our globe,
+whether animal or vegetable, in the older epochs, exhibited forms so
+strikingly contrasted with those which we see around us, that there is
+hardly anything in common between the two. It is constantly tacitly
+assumed that we have before us all the forms of life which have ever
+existed; and though the progress of knowledge, yearly and almost
+monthly, drives the defenders of that position from their ground, they
+entrench themselves in the new line of defences as if nothing had
+happened, and proclaim that the _new_ beginning is the _real_
+beginning.
+
+Without for an instant denying or endeavouring to soften down the
+considerable positive differences (the negative ones are met by another
+line of argument) which undoubtedly obtain between the ancient and the
+modern worlds of life, we believe they have been vastly overstated and
+exaggerated, and this belief is based upon certain facts whose value
+does not seem to have been fully appreciated, though they have long
+been more or less completely known.
+
+The multitudinous kinds of animals and plants, both recent and fossil,
+are, as is well known, arranged by zoologists and botanists, in
+accordance with their natural relations, into groups which receive the
+names of sub-kingdoms, classes, orders, families, genera and species.
+Now it is a most remarkable circumstance that, viewed on the great
+scale, living beings have differed so little throughout all geologic
+time that there is no sub-kingdom and no class wholly extinct or
+without living representatives.
+
+If we descend to the smaller groups, we find that the number of orders
+of plants is about two hundred; and I have it on the best authority
+that not one of these is exclusively fossil; so that there is
+absolutely not a single extinct ordinal type of vegetable life; and it
+is not until we descend to the next group, or the families, that we
+find types which are wholly extinct. The number of orders of animals,
+on the other hand, may be reckoned at a hundred and twenty, or
+thereabouts, and of these, eight or nine have no living
+representatives. The proportion of extinct ordinal types of animals to
+the existing types, therefore, does not exceed seven per cent.—a
+marvellously small proportion when we consider the vastness of geologic
+time.
+
+Another class of considerations—of a different kind, it is true, but
+tending in the same direction—seems to have been overlooked. Not only
+is it true that the general plan of construction of animals and plants
+has been the same in all recorded time as at present, but there are
+particular kinds of animals and plants which have existed throughout
+vast epochs, sometimes through the whole range of recorded time, with
+very little change. By reason of this persistency, the typical form of
+such a kind might be called a “persistent type,” in contradistinction
+to those types which have appeared for but a short time in the course
+of the world’s history. Examples of these persistent types are abundant
+enough in both the vegetable and the animal kingdoms. The oldest group
+of plants with which we are well acquainted is that of whose remains
+coal is constituted; and as far as they can be identified, the
+carboniferous plants are ferns, or club-mosses, or Coniferae, in many
+cases generically identical with those now living!
+
+Among animals, instances of the same kind may be found in every
+sub-kingdom. The _Globigerina_ of the Atlantic soundings is identical
+with that which occurs in the chalk; and the casts of lower silurian
+_Foraminifera_, which Ehrenberg has recently described, seem to
+indicate the existence at that remote period of forms singularly like
+those which now exist. Among the corals, the palaeozoic _Tabulata_ are
+constructed on precisely the same type as the modern millepores; and if
+we turn to molluscs, the most competent malacologists fail to discover
+any generic distinction between the _Craniae_, _Lingulae_ and
+_Discinae_ of the silurian rocks and those which now live. Our existing
+_Nautilus_ has its representative species in every great formation,
+from the oldest to the newest; and _Loligo_, the squid of modern seas,
+appears in the lias, or at the bottom of the mesozoic series, in a
+form, at most, specifically different from its living congeners. In the
+great assemblage of annulose animals, the two highest classes, the
+insects and spider tribe, exhibit a wonderful persistency of type. The
+cockroaches of the carboniferous epoch are exceedingly similar to those
+which now run about our coal-cellars; and its locusts, termites and
+dragon-flies are closely allied to the members of the same groups which
+now chirrup about our fields, undermine our houses, or sail with swift
+grace about the banks of our sedgy pools. And, in like manner, the
+palaeozoic scorpions can only be distinguished by the eye of a
+naturalist from the modern ones.
+
+Finally, with respect to the _Vertebrata_, the same law holds good:
+certain types, such as those of the ganoid and placoid fishes, having
+persisted from the palaeozoic epoch to the present time without a
+greater amount of deviation from the normal standard than that which is
+seen within the limits of the group as it now exists. Even among the
+_Reptilia_—the class which exhibits the largest proportion of entirely
+extinct forms of any one type,—that of the _Crocodilia_, has persisted
+from at least the commencement of the mesozoic epoch up to the present
+time with so much constancy, that the amount of change which it
+exhibits may fairly, in relation to the time which has elapsed, be
+called insignificant. And the imperfect knowledge we have of the
+ancient mammalian population of our earth leads to the belief that
+certain of its types, such as that of the _Marsupialia_, have persisted
+with correspondingly little change through a similar range of time.
+
+Thus it would appear to be demonstrable, that, notwithstanding the
+great change which is exhibited by the animal population of the world
+as a whole, certain types have persisted comparatively without
+alteration, and the question arises, What bearing have such facts as
+these on our notions of the history of life through geological time?
+The answer to this question would seem to depend on the view we take
+respecting the origin of species in general. If we assume that every
+species of animal and of plant was formed by a distinct act of creative
+power, and if the species which have incessantly succeeded one another
+were placed upon the globe by these separate acts, then the existence
+of persistent types is simply an unintelligible irregularity. Such
+assumption, however, is as unsupported by tradition or by Revelation as
+it is opposed by the analogy of the rest of the operations of nature;
+and those who imagine that, by adopting any such hypothesis, they are
+strengthening the hands of the advocates of the letter of the Mosaic
+account, are simply mistaken. If, on the other hand, we adopt that
+hypothesis to which alone the study of physiology lends any
+support—that hypothesis which, having struggled beyond the reach of
+those fatal supporters, the Telliameds and Vestigiarians, who so nearly
+caused its suffocation by wind in early infancy, is now winning at
+least the provisional assent of all the best thinkers of the day—the
+hypothesis that the forms or species of living beings, as we know them,
+have been produced by the gradual modification of pre-existing
+species—then the existence of persistent types seems to teach us much.
+Just as a small portion of a great curve appears straight, the apparent
+absence of change in direction of the line being the exponent of the
+vast extent of the whole, in proportion to the part we see; so, if it
+be true that all living species are the result of the modification of
+other and simpler forms, the existence of these little altered
+persistent types, ranging through all geological time, must indicate
+that they are but the final terms of an enormous series of
+modifications, which had their being in the great lapse of pregeologic
+time, and are now perhaps for ever lost.
+
+In other words, when rightly studied, the teachings of palaeontology
+are at one with those of physical geology. Our farthest explorations
+carry us back but a little way above the mouth of the great river of
+Life: where it arose, and by what channels the noble tide has reached
+the point when it first breaks upon our view, is hidden from us.
+
+
+The foregoing pages contain the substance of a lecture delivered before
+the Royal Institution of Great Britain many months ago, and of course
+long before the appearance of the remarkable work on the “Origin of
+Species” just published by Mr. Darwin, who arrives at very similar
+conclusions. Although, in one sense, I might fairly say that my own
+views have been arrived at independently, I do not know that I can
+claim any equitable right to property in them; for it has long been my
+privilege to enjoy Mr. Darwin’s friendship, and to profit by
+corresponding with him, and by, to some extent, becoming acquainted
+with the workings of his singularly original and well-stored mind. It
+was in consequence of my knowledge of the general tenor of the
+researches in which Mr. Darwin had been so long engaged; because I had
+the most complete confidence in his perseverance, his knowledge, and,
+above all things, his high-minded love of truth; and, moreover, because
+I found that the better I became acquainted with the opinions of the
+best naturalists regarding the vexed question of species, the less
+fixed they seemed to be, and the more inclined they were to the
+hypothesis of gradual modification, that I ventured to speak as
+strongly as I have done in the final paragraphs of my discourse.
+
+Thus, my daw having so many borrowed plumes, I see no impropriety in
+making a tail to this brief paper by taking another handful of feathers
+from Mr. Darwin; endeavouring to point out in a few words, in fact,
+what, as I gather from the perusal of his book, his doctrines really
+are, and on what sort of basis they rest. And I do this the more
+willingly, as I observe that already the hastier sort of critics have
+begun, not to review my friend’s book, but to howl over it in a manner
+which must tend greatly to distract the public mind.
+
+No one will be better satisfied than I to see Mr. Darwin’s book
+refuted, if any person be competent to perform that feat; but I would
+suggest that refutation is retarded, not aided, by mere sarcastic
+misrepresentation. Every one who has studied cattle-breeding, or turned
+pigeon-fancier, or “pomologist,” must have been struck by the extreme
+modifiability or plasticity of those kinds of animals and plants which
+have been subjected to such artificial conditions as are imposed by
+domestication. Breeds of dogs are more different from one another than
+are the dog and the wolf; and the purely artificial races of pigeons,
+if their origin were unknown, would most assuredly be reckoned by
+naturalists as distinct species and even genera.
+
+These breeds are always produced in the same way. The breeder selects a
+pair, one or other, or both, of which present an indication of the
+peculiarity he wishes to perpetuate, and then selects from the
+offspring of them those which are most characteristic, rejecting the
+others. From the selected offspring he breeds again, and, taking the
+same precautions as before, repeats the process until he has obtained
+the precise degree of divergence from the primitive type at which he
+aimed.
+
+If he now breeds from the variety thus established for some
+generations, taking care always to keep the stock pure, the tendency to
+produce this particular variety becomes more and more strongly
+hereditary; and it does not appear that there is any limit to the
+persistency of the race thus developed.
+
+Men like Lamarck, apprehending these facts, and knowing that varieties
+comparable to those produced by the breeder are abundantly found in
+nature, and finding it impossible to discriminate in some cases between
+varieties and true species, could hardly fail to divine the possibility
+that species even the most distinct were, after all, only exceedingly
+persistent varieties, and that they had arisen by the modification of
+some common stock, just as it is with good reason believed that
+turnspits and greyhounds, carrier and tumbler pigeons, have arisen.
+
+But there was a link wanting to complete the parallel. Where in nature
+was the analogue of the breeder to be found? How could that operation
+of selection, which is his essential function, be carried out by mere
+natural agencies? Lamarck did not value this problem; neither did he
+admit his impotence to solve it; but he guessed a solution. Now,
+guessing in science is a very hazardous proceeding, and Lamarck’s
+reputation has suffered woefully for the absurdities into which his
+baseless suppositions led him.
+
+Lamarck’s conjectures, equipped with a new hat and stick, as Sir Walter
+Scott was wont to say of an old story renovated, formed the foundation
+of the biological speculations of the “Vestiges,” a work which has done
+more harm to the progress of sound thought on these matters than any
+that could be named; and, indeed, I mention it here simply for the
+purpose of denying that it has anything in common with what essentially
+characterises Mr. Darwin’s work.
+
+The peculiar feature of the latter is, in fact, that it professes to
+tell us what in nature takes the place of the breeder; what it is that
+favours the development of one variety into which a species may run,
+and checks that of another; and, finally, shows how this natural
+selection, as it is termed, may be the physical cause of the production
+of species by modification.
+
+That which takes the place of the breeder and selector in nature is
+Death. In a most remarkable chapter, “On the Struggle for Existence,”
+Mr. Darwin draws attention to the marvellous destruction of life which
+is constantly going on in nature. For every species of living thing, as
+for man, “_Eine Bresche ist ein jeder Tag_.”—Every species has its
+enemies; every species has to compete with others for the necessaries
+of existence; the weakest goes to the wall, and death is the penalty
+inflicted on all laggards and stragglers. Every variety to which a
+species may give rise is either worse or better adapted to surrounding
+circumstances than its parent. If worse, it cannot maintain itself
+against death, and speedily vanishes again. But if better adapted, it
+must, sooner or later, “improve” its progenitor from the face of the
+earth, and take its place. If circumstances change, the victor will be
+similarly supplanted by its own progeny; and thus, by the operation of
+natural causes, unlimited modification may in the lapse of long ages
+occur.
+
+For an explanation of what I have here called vaguely “surrounding
+circumstances,” and of why they continually change—for ample proof that
+the “struggle for existence” is a very great reality, and assuredly
+_tends_ to exert the influence ascribed to it—I must refer to Mr.
+Darwin’s book. I believe I have stated fairly the position upon which
+his whole theory must stand or fall; and it is not my purpose to
+anticipate a full review of his work. If it can be proved that the
+process of natural selection, operating upon any species, can give rise
+to varieties of species so different from one another that none of our
+tests will distinguish them from true species, Mr. Darwin’s hypothesis
+of the origin of species will take its place among the established
+theories of science, be its consequences whatever they may. If, on the
+other hand, Mr. Darwin has erred, either in fact or in reasoning, his
+fellow-workers will soon find out the weak points in his doctrines, and
+their extinction by some nearer approximation to the truth will
+exemplify his own principle of natural selection.
+
+In either case the question is one to be settled only by the
+painstaking, truth-loving investigation of skilled naturalists. It is
+the duty of the general public to await the result in patience; and,
+above all things, to discourage, as they would any other crimes, the
+attempt to enlist the prejudices of the ignorant, or the
+uncharitableness of the bigoted, on either side of the controversy.
+
+
+ * “Macmillan’s Magazine,” December 1859.
+
+
+
+
+End of the Project Gutenberg EBook of Time and Life: Mr. Darwin's “Origin of Species”, by Thomas H. Huxley
+
+*** END OF THIS PROJECT GUTENBERG EBOOK TIME AND LIFE: MR. DARWIN'S “ORIGIN OF SPECIES” ***
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