Among the many interesting issues raised by the discovery of Mammoth remains in large numbers along the Arctic borders of Eastern Asia, one has, I think, ceased to be polemical. So far as I know, there is no serious student who now contests the fact that the Mammoth and his companions lived where their remains are found. The rooted trees upon which they fed, and the southern river-shells which were their contemporaries, both of which are found with their remains (both being incapable of migration), prove incontestably what a score of other arguments show, that the fauna of North-Eastern Siberia in the Mammoth age, like its flora, must be explained by some other theory than migration. This I have urged in many ways in my work on the Mammoth.