It would be difficult to find anywhere a greater contrast than that which is presented by some of these British Columbian natives, those, for instance, of Harrison Lake with almost circular heads (88.8), and some of the Labrador Eskimo with a degree of dolichocephaly not exceeded even by the Fijian Kai-Colos (65)[757]. But this violent contrast is somewhat toned by the intermediate forms, such as those of the Tlingits, the Aleutian islanders, and the western (Alaskan) Eskimo, by which the transition is effected between the Arctic and the more southern populations. It is not possible at present to indicate even in outline the chronology of any of the ethnic movements outlined above. Warren K. Moorehead[758] agrees with the great majority of American archaeologists in holding the existence of palaeolithic man in North America as not proven[759], the so-called palaeoliths being either rejects or rude tools for rough purposes. When man migrated to America from North and East Asia whenever that period may have been, he appears to have been in that stage of culture--or rather of stone technique--which we term Neolithic, and the drifting movement ceased before he had learnt the use of metals. A further proof of the antiquity of the migrations is afforded by linguistics. A. F. Chamberlain asserts[760] that "it may be said with certainty, so far as all data hitherto presented are concerned, that no satisfactory proof whatever has been put forward to induce us to believe that any single American Indian tongue or group of tongues has been derived from any Old World form of speech now existing or known to have existed in the past. In whatever way the multiplicity of American Indian languages and dialects may have arisen, one can be reasonably sure that the differentiation and divergence have developed here in America and are in no sense due to the occasional intrusion of Old World tongues individually or _en masse_.... Certain real relationships between the American Indians and the peoples of north-eastern Asia, known as 'Paleo-Asiatics,' have, however, been revealed as a result of the extensive investigations of the Jesup North Pacific Expedition.... The general conclusion to be drawn from the evidence is that the so-called 'Paleo-Asiatic' peoples of north-eastern Asia, _i.e._ the Chukchee, Koryak, Kamchadale, Gilyak, Yukaghir, etc. really belong physically and culturally with the aborigines of north-western America.... Like the modern Asiatic Eskimo they represent a reflex from America and Asia, and not _vice versa_.... It is the opinion of good authorities also that the 'Paleo-Asiatic' peoples belong linguistically with the American Indians rather than with the other tribes and stocks of northern or southern Asia. Here we have then the only real relationship of a linguistic character that has ever been convincingly argued between tongues of the New World and tongues of the Old."