It seems probable that the ancient northern elephant continued in existence in North America down to the time when this continent was inhabited by man. It can hardly be doubted that the very ancient human beings, whose remains are preserved to us beneath the lava streams of California, dwelt on the continent along with the mammoth. In excavations which I have made at Big Bone Lick in Kentucky, where a group of saline springs emerges at the bottom of a valley, there were disclosed a very great number of skeletons of this great elephant, commingled with the bones of one or two smaller forms of the related genus, the mastodon. At a slightly higher level was the multitude of remains belonging to an extinct species of bison which came just before our so-called buffalo, while near the surface of the ground was found the waste of the creatures which were in the field when it was first seen by the white men. A very careful search failed to reveal any trace of man until the uppermost level was attained. The facts, which cannot well be discussed here, have led me to the conclusion that only a few thousand years can have elapsed since the mammoth and the mastodon plentifully abounded in North America; but I am forced to doubt whether our savages were here in time to make acquaintance with these animals. It is not certain that the extermination of the great northern elephant or mammoth even in the Old World came about through the action of man. It is possible that the death was due to more natural causes, such as the change of climate which attended the decline of the Glacial period, or to the attacks of some insect enemy like the tsetze fly of South Africa, which occasionally brings destruction to cattle in that part of the world. On the whole, however, it seems most probable that the extermination of this noble beast is to be accounted among the brutal triumphs of mankind, perhaps as the first of the long tale of destructions which he has inflicted upon his fellow-creatures. However this may be, it is clear that at the dawn of civilization the species of the genus elephas had become limited to that part of the African continent which lies south of the Sahara, and to the portion of Asia east of the Persian Gulf and south of China. The remnant consisted of two species: the African form, on the average the larger of the two, a fierce and scarcely domesticable creature; and the Asiatic, a milder-natured species which alone has been to any extent brought into the service of man.