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So far as the Upper Eocene and the Miocene Mammalian Faunae are comparable, their relations are such as in no way to oppose the hypothesis that the older are the progenitors of the more recent forms, while, in some cases, they distinctly favour that hypothesis.
Thus, midway between Australia and South America, each of which possesses an abundant and diversified mammalian fauna, a mass of land, which may have been as large as both put together, must have existed without a mammalian inhabitant.
The chemical condition of all the bones was found to be the same. Quite a full account is given of the researches of MM. Journal and Christol in the Bize cavern, and of Dr. Schmerling in the Liége caverns, and every effort made, apparently, by the author, to weigh candidly and honestly the evidence for and against the contemporaneous existence and deposition of the human and mammalian remains.
In the same way, besides his domestic animals, this spoil-sport colonist man brought in his train accidentally rabbits, weasels, mice, and rats, which now abound in many parts of the group, so that the islands have now in effect a wild mammalian fauna.
Thus, there can be little doubt that the mammary gland was as apparently useless in the remotest male mammalian ancestor of man as in living men, and yet it has not disappeared. Is it then still profitable to the male organism to retain it? II. Professor Haeckel looks upon the causes which have led to the present diversity of living nature as twofold.
The remains of the fossil Alligator, known as the mosasaurus, are also here, together with the wealden lizard of Kent, which was about twenty-five feet in length, and part of Cuvier's wonderful fossil Flying Lizard, or sterodactylus, which is described as a reptile having mammalian characteristics, a bat's wings, enormous eyes, and a bird's neck.
They come almost together plants being probably actually the first, and mollusca, fishes, and saurians. Nor should we wonder if mammalian forms had occurred earlier. E.g. The italics are of course mine.
Man has impudent assurance enough for anything, and if Nature has been working at the perfection of an instrument for her purpose during a few score million years an instrument such as the mammalian mother, for instance man is quite prepared to invent social devices, such as the incubator, the crèche, the infant milk dépôt, and so forth; not merely to make the best of a bad case when the mother fails, but to supersede the mother altogether directly the baby is born.
No doubt, the excellent author of one of the most remarkable contributions to the just understanding of the mammalian brain which has ever been made, would have been the first to admit the insufficiency of his data had he lived to profit by the advance of inquiry.
Side by side with this wonderful outgrowth of the mammalian type, in the first plasticity of its vigorous youth, the older marsupials die away one by one in the geological record before the faces of their more successful competitors; the new carnivores devour them wholesale, the new ruminants eat up their pastures, the new rodents outwit them in the modernised forests.
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