It is not stated whether the system is current amongst the other Yukaghir tribes, who dwell on the banks of the Indigirka, Yana, Kerkodona, and neighbouring districts. They thus skirt the Frozen Ocean from near the Lena delta to and beyond the Kolyma, and are conterminous landwards with the Yakuts on the south-west and the Chukchi on the north-east. With the Chukchi, the Koryaks, the Kamchadales, and the Gilyaks they form a separate branch of the Mongolic division sometimes grouped together as "Hyperboreans," but distinguished from other Ural-Altaic peoples perhaps strictly on linguistic grounds. Although now reduced to scarcely 1500, the Yukaghirs were formerly a numerous people, and the popular saying that their hearths on the banks of the Kolyma at one time outnumbered the stars in the sky seems a reminiscence of more prosperous days. But great inroads have been made by epidemics, tribal wars, the excessive use of coarse Ukraine tobacco and of bad spirits, indulged in even by the women and children. "A Yukaghir, it is said, never intoxicates himself alone, but calls upon his family to share the drink, even children in arms being supplied with a portion[632]." Their language, which A. Schiefner regards as radically distinct from all others[633], is disappearing even more rapidly than the people themselves, if it be not already quite extinct. In the eighties it was spoken only by about a dozen old persons, its place being taken almost everywhere by the Turki dialect of the Yakuts[634]. There appears to be a curious interchange of tribal names between the Chukchi and their Koryak neighbours, the term _Koryak_ being the Chukchi _Khorana_, "Reindeer," while the Koryaks are said to call themselves _Chauchau_, whence some derive the word _Chukchi_. Hooper, however, tells us that the proper form of Chukchi is _Tuski_, "Brothers," or "Confederates[635]," and in any case the point is of little consequence, as Dittmar is probably right in regarding both groups as closely related, and sprung originally from one stock[636]. Jointly they occupy the north-east extremity of the continent between the Kolyma and Bering Strait, together with the northern parts of Kamchatka; the Chukchi lying to the north, the Koryaks to the south, mainly round about the north-eastern inlets of the Sea of Okhotsk. Reasons have already been advanced for supposing that the Chukchi were a Tungus people who came originally from the Amur basin. In their arctic homes they appear to have waged long wars with the Onkilon (Ang-kali) aborigines, gradually merging with the survivors and also mingling both with the Koryaks and Chuklukmiut Eskimo settled on the Asiatic side of Bering Strait.