Ryabinina I. The sources of the language history study in the Ukrainian and Russian linguistics of the 19th – 30s of the 20th centuries.

The problem of sources of studying a language in the Ukrainian and Russian linguistics of the 19th – 30s of the 20th centuries is touched upon in this thesis for the first time in the linguistic historiography. Specific features of the theoretic and practical solution of the problem in question in the comparative-historical science of languages of the first (20s-60s of the 19th century) and the second (70s of the 19th-30s of the 20th century) periods with account taken of the continuity and evolution of the scientific thought are revealed primarily on the feature items of historical phonetics of the East-Slavic language group. The contribution of Ukrainian and Russian comparativists into solving such problems as: defining the circle of sources concerning the language history study and prioritiveness of these sources, emergence and perfection of the methods of investigating the material of ancient literary texts, combining different sources in the process of studying the history of a language, is defined in the paper.