Much controversy has been waged regarding the original home of the Sumerians and the particular racial type which they represented. One theory connects them with the lank-haired and beardless Mongolians, and it is asserted on the evidence afforded by early sculptural reliefs that they were similarly oblique-eyed. As they also spoke an agglutinative language, it is suggested that they were descended from the same parent stock as the Chinese in an ancient Parthian homeland. If, however, the oblique eye was not the result of faulty and primitive art, it is evident that the Mongolian type, which is invariably found to be remarkably persistent in racial blends, did not survive in the Tigris and Euphrates valleys, for in the finer and more exact sculpture work of the later Sumerian period the eyes of the ruling classes are found to be similar to those of the Ancient Egyptians and southern Europeans. Other facial characteristics suggest that a Mongolian racial connection is highly improbable; the prominent Sumerian nose, for instance, is quite unlike the Chinese, which is diminutive. Nor can far-reaching conclusions be drawn from the scanty linguistic evidence at our disposal. Although the languages of the Sumerians and long-headed Chinese are of the agglutinative variety, so are those also which are spoken by the broad-headed Turks and Magyars of Hungary, the broad-headed and long-headed, dark and fair Finns, and the brunet and short-statured Basques with pear-shaped faces, who are regarded as a variation of the Mediterranean race with distinctive characteristics developed in isolation. Languages afford no sure indication of racial origins or affinities.

Another theory connects the Sumerians with the broad-headed peoples of the Western Asian plains and plateaus, who are vaguely grouped as Ural-Altaic stock and are represented by the present-day Turks and the dark variety of Finns. It is assumed that they migrated southward in remote times in consequence of tribal pressure caused by changing climatic conditions, and abandoned a purely pastoral for an agricultural life. The late Sumerian sculpture work again presents difficulties in this connection, for the faces and bulging occiputs suggest rather a long-headed than a broad-headed type, and the theory no longer obtains that new habits of life alter skull forms which are usually associated with other distinctive traits in the structure of skeletons. These broad-headed nomadic peoples of the Steppes are allied to Tatar stock, and distinguished from the pure Mongols by their abundance of wavy hair and beard. The fact that the Sumerians shaved their scalps and faces is highly suggestive in this connection. From the earliest times it has been the habit of most peoples to emphasize their racial characteristics so as to be able, one may suggest, to distinguish readily a friend from a foeman. At any rate this fact is generally recognized by ethnologists. The Basques, for instance, shave their pointed chins and sometimes grow short side whiskers to increase the distinctive pear-shape which is given to their faces by their prominent temples. In contrast, their neighbours, the Andalusians, grow chin whiskers to broaden their already rounded chins, and to distinguish them markedly from the Basques.12 Another example of similar character is afforded in Asia Minor, where the skulls of the children of long-headed Kurds are narrowed, and those of the children of broad-headed Armenians made flatter behind as a result of systematic pressure applied by using cradle boards. In this way these rival peoples accentuate their contrasting head forms, which at times may, no doubt, show a tendency towards variation as a result of the crossment of types. When it is found, therefore, that the Sumerians, like the Ancient Egyptians, were in the habit of shaving, their ethnic affinities should be looked for among a naturally glabrous rather than a heavily-bearded people.

A Central Asiatic source for Sumerian culture has also been urged of late with much circumstantial detail. It breaks quite fresh and interesting ground. Recent scientific expeditions in Russian and Chinese Turkestan have accumulated important archaeological data which clearly establish that vast areas of desert country were at a remote period most verdurous and fruitful, and thickly populated by organized and apparently progressive communities. From these ancient centres of civilization wholesale migrations must have been impelled from time to time in consequence of the gradual encroachment of wind-distributed sand and the increasing shortage of water. At Anau in Russian Turkestan, where excavations were conducted by the Pumpelly expedition, abundant traces were found of an archaic and forgotten civilization reaching back to the Late Stone Age. The pottery is decorated with geometric designs, and resembles somewhat other Neolithic specimens found as far apart as Susa, the capital of ancient Elam, on the borders of Babylonia, Boghaz Köi in Asia Minor, the seat of Hittite administration, round the Black Sea to the north, and at points in the southern regions of the Balkan Peninsula. It is suggested that these various finds are scattered evidences of early racial drifts from the Central Asian areas which were gradually being rendered uninhabitable. Among the Copper Age artifacts at Anau are clay votive statuettes resembling those which were used in Sumeria for religious purposes. These, however, cannot be held to prove a racial connection, but they are important in so far as they afford evidence of early trade relations in a hitherto unsuspected direction, and the long distances over which cultural influence extended before the dawn of history. Further we cannot go. No inscriptions have yet been discovered to render articulate this mysterious Central Asian civilization, or to suggest the original source of early Sumerian picture writing. Nor is it possible to confirm Mr. Pumpelly's view that from the Anau district the Sumerians and Egyptians first obtained barley and wheat, and some of their domesticated animals. If, as Professor Elliot Smith believes, copper was first used by the Ancient Egyptians, it may be, on the other hand, that a knowledge of this metal reached Anau through Sumeria, and that the elements of the earlier culture were derived from the same quarter by an indirect route. The evidence obtainable in Egypt is of interest in this connection. Large quantities of food have been taken from the stomachs and intestines of sun-dried bodies which have lain in their pre-Dynastic graves for over sixty centuries. This material has been carefully examined, and has