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Updated: July 4, 2025
Notwithstanding the abundance of mammalian bones in the peat, and the frequency of stone implements of the Celtic and Gallo-Roman periods, M. Boucher de Perthes has only met with three or four fragments of human skeletons.
But at the same time, if my theory is true that while the animals which surrounded him have been undergoing modification in all parts of their bodies to a generic or even family degree of difference, he has been changing almost wholly in the brain and head then, in geological antiquity the species of man may be as old as many mammalian families, and the origin of the family man may date back to a period when some of the orders first originated.
Finally, a vast period must be granted for the development of the lowest mammalian type from the primitive stock of the whole vertebrate sub-kingdom. If this be even an approximation to the truth, then there seem to be strong reasons for believing that geological time is not sufficient for such a process.
The members of the class mammalia differ much among themselves; and now that we recognize clearly that man is a mammalian vertebrate, the next question is whether an order exists to which our type must be assigned, or whether we have at last reached a point where it is justifiable to establish an isolated division to contain the human species alone.
And as he has there shown, this can have but one result, and that is the family life of man. And we may yet very possibly have to acknowledge that family life of a very low grade is just as truly characteristic of the higher apes as of lower man. And thus the family life of man is the physiological result of, and rooted in, mammalian structure.
But in South America, although he is in places responsible for the wanton slaughter of the most interesting and the largest, or the most beautiful, birds, his advent has meant a positive enrichment of the wild mammalian fauna.
In a similar way, various diverse mammalian forms, as the tapir, the rhinoceros, and the horse, are linked together by fossil progenitors.
Nature, in obedience to man's behests, and smiling with secret satire over her work, has made it ponderous and ungraceful as any clumsy mammalian, wombat, ardvaark, manatee, or hippopotamus.
Ground sloth and glyptodon, sabre-tooth, horse and mastodon, and all the associated animals of large size, vanished, and South America, though still retaining its connection with North America, once again became a land with a mammalian life small and weak compared to that of North America and the Old World.
For the third calculation, communicated to me by M. Morlot, we are indebted to M. Victor Gillieron, of Neuveville, on the Lake of Bienne. It relates to the age of a pile-dwelling, the mammalian bones of which are considered by M. Rutimeyer to indicate the earliest portion of the stone period of Switzerland, and to correspond in age with the settlement of Moosseedorf.
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