E. H. Parker unfortunately lent the weight of his authority to the statement that the word "Tuerkoe" [Turki] "goes no farther back than the fifth century of our era," and that "so far as recorded history is concerned the name of Turk dates from this time[679]." But Turki tribes bearing this national name had penetrated into East Europe hundreds of years before that time, and were already seated on the Tanais (Don) about the new era. They are mentioned by name both by Pomponius Mela[680] and by Pliny[681], and to the same connection belonged, beyond all doubt, the warlike _Parthians_, who 300 years earlier were already seated on the confines of Iran and Turan, routed the legions of Crassus and Antony, and for five centuries (250 B.C.-229 A.D.) usurped the throne of the "King of Kings," holding sway from the Euphrates to the Ganges, and from the Caspian to the Indian Ocean. Direct descendants of the Parthians are the fierce Turkoman nomads, who for ages terrorised over all the settled populations encircling the Aralo-Caspian depression. Their power has at last been broken by the Russians, but they are still politically dominant in Persia[682]. They have thus been for many ages in the closest contact with Caucasic Iranians, with the result that the present Turkoman type is shown by J. L. Yavorsky's observations to be extremely variable[683]. Both the Parthians and the _Massagetae_ have been identified with the _Yue-chi_, who figured so largely in the annals of the Han dynasties, and are above mentioned as having been driven west to Sungaria by the Hiung-nu after the erection of the Great Wall. It has been said that, could we follow the peregrinations of the Yue-chi bands from their early seats at the foot of the Kinghan mountains to their disappearance amid the snows of the Western Himalayas, we should hold the key to the solution of the obscure problems associated with the migrations of the Mongolo-Turki hordes since the torrent of invasion was diverted westwards by Shih Hwang Ti's mighty barrier. One point, however, seems clear enough, that the Yue-chi were a different people both from the Parthians who had already occupied Hyrcania (Khorasan) at least in the third century B.C., if not earlier, and from the Massagetae. For the latter were seated on the Yaxartes (Sir-darya) in the time of Cyrus (sixth century B.C.), whereas the Yue-chi still dwelt east of Lake Lob (Tarim basin) in the third century. After their defeat by the Hiung-nu and the Usuns (201 and 165 B.C.), they withdrew to Sogdiana (Transoxiana), reduced the _Ta-Hia_ of Baktria, and in 126 B.C. overthrew the Graeco-Baktrian kingdom, which had been founded after the death of Alexander towards the close of the fourth century. But in the Kabul valley, south of the Hindu-Kush, the Greeks still held their ground for over 100 years, until Kadphises I., king of the Kushans--a branch of the Yue-chi--after uniting the whole nation in a single