Even more interesting than these for our present purposes was the discovery a few years later of human remains in the valleys of the Dordogne and other rivers of the south of France. Here geology does not help us, but climatology does. At that time the climate of the south of France was so cold that the inhabitants of these caves had all the habits of people now dwelling in the Arctic regions. Their principal domestic animal was the reindeer, but they were familiar with the woolly-haired mammoth, the cave bear, and the aurochs. The climate was so cold that they could throw on one side the débris of their feasts, and floor their dwelling with marrow bones and offal without dreading pestilence or even suffering inconvenience. They were, in fact, in every respect, so far as we have the means of judging, identical with the Esquimaux of the present day, and must have inhabited a climate nearly similar to that of Arctic North America. How long ago was this? We know from the pictures in the tombs near the pyramids that the climate of Egypt was the same 5000 or 6000 years ago as it is now, and we have no reason to suppose that, while that of the southern shores of the Mediterranean remained unchanged, the northern would vary in any very different ratio. Clearing of forests may have done something, but never could have accounted for such a change as this. If we take 50,000 or 60,000 years instead of 5000 or 6000, it will not suffice for such a revolution, though geologists will be wroth if we assume only 100,000; as a convenient number this will answer our present purposes. Having at least this space of time at their disposal, the tendency of modern antiquaries has been to sweep everything into this great gulf. Why, they ask, may not Stonehenge and Avebury be 10,000, 20,000, or 50,000 years old? Man then existed, and why may he not have erected such monuments as these? Of course he might, but there is no proof that he did, and as no single tangible reason has yet been adduced for supposing them so old, the mere presumption that they might be so cannot count for much.