ИСТИНА

The statement that different discourses interact is one of the main in modern linguistics. Treatises being the basic among the genres of scientific discourse proves this statement. On the one hand it follows the standards formed during its development, on the other hand it reflects the author's personality along with such factors as world view and cultural changes. The treatises written by Ch.Darwin is a good example to study it in full. Some deviations from the standards depict Ch.Darwin as a linguistic personality and can be regarded as a model to follow in the process of writing study in science.