He then adds his proofs of the occurrence of revolutions before the existence of living beings. Like Lamarck, Cuvier was a Wernerian, and in speaking of the older or primitive crystalline rocks which contain no vestige of fossils, he accepted the view of the German theorist in geology, that granites forming the axis of mountain chains were formed in a fluid.
We must give Cuvier the credit of fully appreciating the value of fossils as being what he calls “historical documents,” also for appreciating the fact that there were a number of revolutions marking either the incoming or end of a geological period; but as he failed to perceive the unity of organization in organic beings, and their genetic relationship, as had been indicated by Lamarck and by Geoffroy St. Hilaire, so in geological history he did not grasp, as did Lamarck, the vast extent of geological time, and the general uninterrupted continuity of geological events. He was analytic, thoroughly believing in the importance of confining himself to the discovery of facts, and, considering the multitude of fantastic hypotheses and suggestions of previous writers of the eighteenth century, this was sound, sensible, and thoroughly scientific. But unfortunately he did not stop here. Master of facts concerning the fossil mammals of the Paris Basin, he also—usually cautious and always a shrewd man of the world—fell into the error of writing his “theory of the world,” and of going to the extreme length of imagining universal catastrophes where there are but local ones, a universal Noachian deluge when there was none, and of assuming that there were at successive periods thoroughgoing total and sudden extinctions of life, and as sudden recreations. Cuvier was a natural leader of men, a ready debater, and a clear, forcible writer, a man of great executive force, but lacking in insight and imagination; he dominated scientific Paris and France, he was the law-giver and autocrat of the laboratories of Paris, and the views of quiet, thoughtful, profound scholars such as Lamarck and Geoffroy St. Hilaire were disdainfully pushed aside, overborne, and the progress of geological thought was arrested, while, owing to his great prestige, the rising views of the Lamarckian school were nipped in the bud. Every one, after the appearance of Cuvier’s great work on fossil mammals and of his Règne Animal, was a Cuvierian, and down to the time of Lyell and of Charles Darwin all naturalists, with only here and there an exception, were pronounced Cuvierians in biology and geology—catastrophists rather than uniformitarians. We now, with the increase of knowledge of physical and historical geology, of the succession of life on the earth, of the unity of organization pervading that life from monad to man all through the ages from the Precambrian to the present age, know that there were vast periods of preparation followed by crises, perhaps geologically brief, when there were widespread changes in physical geography, which reacted on the life-forms, rendering certain ones extinct, and modifying others; but this conception is entirely distinct from the views of Cuvier and his school,[101] which may, in the light of our present knowledge, properly be deemed not only totally inadequate, but childish and fantastic.
Cuvier cites the view of Dolomieu, the well-known geologist and mineralogist (1770–1801), only, however, to reject it, who went to the extent of supposing that “tides of seven or eight hundred fathoms have carried off from time to time the bottom of the ocean, throwing it up in mountains and hills on the primitive valleys and plains of the continents” (Dolomieu in Journal de Physique).
Cuvier met with objections to his extreme views. In his discourse he thus endeavors to answer “the following objection” which “has already been stated against my conclusions”:
“Why may not the non-existing races of mammiferous land quadrupeds be mere modifications or varieties of those ancient races which we now find in the fossil state, which modifications may have been produced by change of climate and other local circumstances, and since raised to the present excessive differences by the operation of similar causes during a long succession of ages?
“This objection may appear strong to those who believe in the indefinite possibility of change of forms in organized bodies, and think that during a succession of ages, and by alternations of habits, all the species may change into each other, or one of them give birth to all the rest. Yet to these persons the following answer may be given from their own system: If the species have changed by degrees, as they assume, we ought to find traces of this gradual modification. Thus, between the Palæotherium and the species of our own days, we should be able to discover some intermediate forms; and yet no such discovery has ever been made. Since the bowels of the earth have not preserved monuments of this strange genealogy, we have a right to conclude that the ancient and now extinct species were as permanent in their forms and characters as those which exist at present; or, at least, that the catastrophe which destroyed them did not have sufficient time for the production of the changes that are alleged to have taken place.”
Cuvier thus emphatically rejects all idea that any of the tertiary mammals could have been the ancestral forms of those now existing.
“From all these well-established facts, there does not seem to be the smallest foundation for supposing that the new genera which I have discovered or established among extraneous fossils, such as the palæotherium, anaplotherium, megalonynx, mastodon, pterodactylis, etc., have ever been the sources of any of our present animals, which only differ as far as they are influenced by time or climate. Even if it should prove true, which I am far from believing to be the case, that the fossil elephants, rhinoceroses, elks, and bears do not differ further from the present existing species of the same genera than the present races of dogs differ among themselves, this would by no means be a sufficient reason to conclude that they were of the same species; since the races or varieties of dogs have been influenced by the trammels of domestication, which these other animals never did and indeed never could experience.”[102]
The extreme views of Cuvier as to the frequent renewal and extinction of life were afterward (in 1850) carried out to an exaggerated extent by D’Orbigny, who maintained that the life of the earth must have become extinct and again renewed twenty-seven times. Similar views were held by Agassiz, who, however, maintained the geological succession of animals and the parallelism between their embryonic development and geological succession, the two foundation stones of the biogenetic law of Haeckel. But immediately after the publication of Cuvier’s Ossemens fossiles, as early as 1813, Von Schlotheim, the founder of vegetable palæontology, refused to admit that each set of beds was the result of such a thoroughgoing revolution.[103]
At a later date Bronn “demonstrated that certain species indeed really passed from one formation to another, and though stratigraphic boundaries are often barriers confining the persistence of some form, still this is not an absolute rule, since the species in nowise appear in their entirety.”[104] At present the persistence of genera like Saccamina, Lingula, Ceratodus, etc., from one age to another, or even through two or more geological ages, is well known, while Atrypa reticulatus, a species of world-wide distribution, lived from near the beginning of the Upper Silurian to the Waverly or beginning of the Carboniferous age.
Such were the views of the distinguished founder of vertebrate palæontology. When we compare the Hydrogéologie of Lamarck with Cuvier’s Discours, we see, though some erroneous views, some very fantastic conceptions are held, in common with others of his time, in regard to changes of level of the land and the origin of the crystalline rocks, that it did contain the principles upon which modern palæontology is founded, while those of Cuvier are now in the limbo—so densely populated—of exploded, ill-founded theories.