That these primitive tribes which we find now are not degenerated specimens of mankind who formerly knew a higher civilization, as it has occasionally been maintained, has sufficiently been proved by Edwin Tylor and Lubbock. However, to the arguments already opposed to the degeneration theory, the following may be added. Save a few tribes clustering in the less-accessible highlands, the "savages" represent a girdle which encircles the more or less civilized nations, and they occupy the extremities of our continents, most of which have retained still, or recently were bearing, an early post-glacial character. Such are the Eskimos and their congeners in Greenland, Arctic America, and Northern Siberia; and, in the Southern hemisphere, the Australians, the Papuas, the Fuegians, and, partly, the Bushmen; while within the civilized area, like primitive folk are only found in the Himalayas, the highlands of Australasia, and the plateaus of Brazil. Now it must be borne in mind that the glacial age did not come to an end at once over the whole surface of the earth. It still continues in Greenland. Therefore, at a time when the littoral regions of the Indian Ocean, the Mediterranean, or the Gulf of Mexico already enjoyed a warmer climate, and became the seats of higher civilizations, immense territories in middle Europe, Siberia, and Northern America, as well as in Patagonia, Southern Africa, and Southern Australasia, remained in early postglacial conditions which rendered them inaccessible to the civilized nations of the torrid and sub-torrid zones. They were at that time what the terrible urmans of North-West Siberia are now, and their population, inaccessible to and untouched by civilization, retained the characters of early post-glacial man. Later on, when desiccation rendered these territories more suitable for agriculture, they were peopled with more civilized immigrants; and while part of their previous inhabitants were assimilated by the new settlers, another part migrated further, and settled where we find them. The territories they inhabit now are still, or recently were, sub-glacial, as to their physical features; their arts and implements are those of the neolithic age; and, notwithstanding their racial differences, and the distances which separate them, their modes of life and social institutions bear a striking likeness. So we cannot but consider them as fragments of the early post-glacial population of the now civilized area.