The contribution deals with the conception of language history as a discipline of the diachronic linguistics and also with the contents of the synthetical works on language history, the latter of which are the major task of language history. In the light of more recent works on the development of the Czech language the author gives a short description of the Polish discussion about the contents of the language history and the synthetical language history works during the last 40 years. Some fundamental postulates formulated in this debate might be useful also for the next synthetical work on Czech language history.
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