It is now generally recognized that the two races which inhabited Sumer and Akkad during the early historical periods were sharply divided from one another not only by their speech but also in their physical characteristics.[34] One of the principal traits by which they may be distinguished consists in the treatment of the hair. While the Sumerians invariably shaved the head and face, the Semites retained the hair of the head and wore long beards. A slight modification in the dressing of the hair was introduced by the Western Semites of the First Babylonian Dynasty, who brought with them from Syria the Canaanite Bedouin custom of shaving the lips and allowing the beard to fall only from the chin; while they also appear to have cut the hair short in the manner of the Arabs or Nabateans of the Sinai peninsula.[35] The Semites who were settled in Babylonia during the earlier period, retained the moustache as well as the beard, and wore their hair long. While recognizing the slight change of custom, introduced for a time during the West Semitic domination, the practice of wearing hair and beard was a Semitic characteristic during all periods of history. The phrase "the black-headed ones," which is of frequent occurrence in the later texts, clearly originated as a description of the Semites, in contradistinction to the Sumerians with their shaven heads. [Illustration: LIMESTONE FIGURE OF AN EARLY SUMERIAN PATESI, OR HIGH OFFICIAL.--Brit. Mus., No. 90929; photo. by Messrs. Mansell & Co.] Another distinctive characteristic, almost equally striking, may be seen in the features of the face as represented in the outline engraving and in the sculpture of the earlier periods. It is true that the Sumerian had a prominent nose, which forms, indeed, his most striking feature, but both nose and lips are never full and fleshy as with the Semites. It is sometimes claimed that such primitive representations as occur upon Ur-Ninâ's bas-reliefs, or in Fig. 1 in the accompanying block, are too rude to be regarded as representing accurately an ethnological type. But it will be noted that the same general characteristics are also found in the later and more finished sculptures of Gudea's period. This fact is illustrated by the two black diorite heads of statuettes figured on the following page. In both examples certain archaic conventions are retained, such as the exaggerated line of the eyebrows, and the unfinished ear; but nose and lips are obviously not Semitic, and they accurately reproduce the same racial type which is found upon the earlier reliefs. [Illustration: Fig. 1.--Fig. 2. Figures of early Sumerians, engraved upon fragments of shell, which were probably employed for inlaying boxes, or for ornamenting furniture. Earliest period: from Tello.--Déc., pl. 46, Nos. 2 and 1.]