Although nearly all are Orthodox Christians, or at least baptized as such, they are mere Shamanists at heart, still conjuring the powers of nature, but offering no worship to a supreme deity, of whom they have a vague notion, though he is too far off to hear, or too good to need their supplications. The world of good and evil spirits, however, has been enriched by accessions from the Russian calendar and pandemonium. Thanks to their commercial spirit, the Yakut language, a very pure Turki idiom, is even more widespread than the race, having become a general medium of intercourse for Tungus, Russian, Mongol and other traders throughout East Siberia, from Irkutsk to the Sea of Okhotsk, and from the Chinese frontier to the Arctic Ocean[705]. To some extent W. Radloff is right in describing the great Kirghiz Turki family as "of all Turks most nearly allied to the Mongols in their physical characters, and by their family names such as Kyptshak [Kipchak], Argyn, Naiman, giving evidence of Mongolian descent, or at least of intermixture with Mongols[706]." But we have already been warned against the danger of attaching too much importance to these tribal designations, many of which seem, after acquiring renown on the battle-field, to have passed readily from one ethnic group to another. There are certain Hindu-Kush and Afghan tribes who think themselves Greeks or Arabs, because of the supposed descent of their chiefs from Alexander the Great or the Prophet's family, and genealogical trees spring up like the conjurer's mango plant in support of such illustrious lineage. The Chagatai (Jagatai) tribes, of Turki stock and speech, take their name from a full-blood Mongol, Chagatai, second son of Jenghiz-Khan, to whom fell Eastern Turkestan in the partition of the empire. In the same way many Uzbeg and Kirghiz Turki tribes are named from famous Mongol chiefs, although no one will deny a strain of true Mongol blood in all these heterogeneous groups. This is evident enough from the square and somewhat flat Mongol features, prominent cheek-bones, oblique eyes, large mouth, feet and hands, yellowish brown complexion, ungainly obese figures and short stature, all of which are characteristic of both sections, the Kara-Kirghiz highlanders, and the Kazaks of the lowlands. Some ethnologists regard these Kirghiz groups, not as a distinct branch of the Mongolo-Turki race, but rather as a confederation of several nomad tribes stretching from the Gobi to the Lower Volga, and mingled together by Jenghiz-Khan and his successors[707].