It only needed the evolution of a true alphabet out of the pictorial symbolism on their painted robes, or the grave-posts of their chiefs, to inaugurate a literature which should embody the orations of the Iroquois Demosthenes, and the songs of a native Homer, for whom a vehicle of thought was already prepared, rich and flexible as poet could desire. So far as the physical traits of the American aborigines furnish any evidence of ethnical affinity they unquestionably suggest some common line of descent with the Asiatic Mongol; and this is consistent with the agglutinate characteristics common to a large class of languages of both continents. But, on the other hand, the characteristic head-form of the Huron-Iroquois, as well as that of Algonkin and other northern tribes, deviates alike from the brachycephalic type of the southern Indians and from that of the Asiatic Mongols. Humboldt, who enjoyed rare opportunities for studying the ethnical characteristics of both continents, but to whom, nevertheless, the northern races, with their dolichocephalic type of head were unknown, dwells, in his _American Researches_, on the striking resemblance which the American race bear to the Asiatic Mongols. Latham classes both under the common head of Mongolidæ; and Dr. Charles Pickering, of the American Exploring Expedition, arrived at the same conclusion as the result of his own independent study of the races of both continents. Nevertheless, however great may be the resemblance in many points between the true Red Indian and the Asiatic Mongol, it falls short of even an approximate physical identity. The Mongolian of Asia is not indeed to be spoken of as one unvarying type any more than the American. But the extent to which the Mongolian head-form and peculiar physiognomy characterise one widely diffused section of the population of the eastern continent, gives it special prominence among the great ethnical divisions of the human race. Morton assigns 1421 as the cranial capacity of eighteen Mongol, and only 1234 as that of 164 American skulls other than Peruvian or Mexican. Dr. Paul Topinard, in discussing the American type, adds: “If we are to rely on the method of cubic measurement followed by Morton, the American skull is one of the least capacious of the whole human race.”[123] But Dr. Morton’s results are in some respects misleading. The mean capacity yielded by the measurements of 214 American skulls in the Peabody Museum of Archæology, including a considerable number of females, is 1331; and with a carefully selected series, excluding exceptionally large and small crania, the results would be higher. Twenty-six male California skulls, for example, yield a mean capacity of 1470. The Huron-Iroquois crania would rank among such exceptional examples.[124] The forehead is, indeed, low and receding, but the general cerebral capacity is good; and Dr. Morton specially notes its approximation to the European mean.[125]