The languages and dialects spoken by the different tribes of this heterogeneous population are more than thirty in number, two-thirds of them being in the eastern end of the range, where the ethnological diversity of the people is most marked. So circumscribed and clearly defined are the limits of many of these languages that in some parts of the Eastern Caucasus it is possible to ride through three or four widely-different linguistic areas in a single day. Languages spoken by only twelve or fifteen settlements are comparatively common; and in South-western Daghestan there is an isolated village of less than fifty houses--the aoul of Innookh--which has a dialect of its own not spoken or understood, so far as has yet been ascertained, by any other portion of the whole Caucasian population. None of these mountain-languages have ever been written, but the early introduction of the Arabic supplied to a great extent this deficiency. Almost every settlement has its _mullah_ or _kadi_, whose religious or judicial duties make it necessary for him to know how to read and write the language of the Koran, and when called upon to do so he acts for his fellow-townsmen in the capacity of amanuensis or scribe. Since 1860 the eminent Russian philologist General Usler has invented alphabets and compiled grammars for six of the principal Caucasian languages, and the latter are now taught in all the government schools established under the auspices of the Russian mountain administration at Vladi Kavkaz, Timour Khan, Shoura and Groznoi. In government the Caucasian highlanders acknowledged previous to the Russian conquest no general head, each separate tribe or community having developed for itself such system of polity as was most in accordance with the needs and temperament of its component members. These systems were of almost all conceivable kinds, from the absolute hereditary monarchies of the Arab khans to the free communities or simple republics of Southern Daghestan. In the former the ruler could take the life of a subject with impunity to gratify a mere caprice, while in the latter a subject who considered himself aggrieved by a decision of the ruler could appeal to the general assembly, which had power to annul the decree and even to change the chief magistrate. Since the Russian conquest the mountaineers have altered to some extent both their forms of government and their mode of life. Blood-revenge and plundering raids into the valley of Georgia have nearly ceased; tribal rulers in most parts of the mountains have given place to Russian _ispravniks_; and the rude and archaic systems of customary law which prevailed everywhere previous to 1860 are being slowly supplanted by the less summary but juster processes of European jurisprudence. Such, in rapid and general outline, are the past history and the present condition of the Caucasian mountaineers.