K. Kleszczowa, A. Rejter (red.), "Bogactwo polszczyzny w świetle jej historii. T. 2" (S. 81-91). Katowice: Wydawnictwo Uniwersytetu Śląskiego.
The author discusses changes which happened to the meaning of the words nauka (science) and alchemia (alchemy) within the scope of the recent 5 hundred years. The aim of the author is to sensitize the reader - language user - to the problems the researcher of old texts must deal with. In order not impose the later perspective on the earlier state of knowledge abstracted from the language, it is necessary to thoroughly analyze the lexicon of the former epoch. A conscious and critical justification of the language from the past should lead to a similar careful approach to the contemporary language.