nguage thus excluding colloquial FS. Both scholars agree that each FS can be recognized by one or more leading features. But IR Galperin pays more attention to the coordination of language means and stylistic devices whereas Arnold connects the specific features of each FS with its peculiarities in the sphere of communication. According to I.R. Galperin, a functional style of language is a system of interrelated language means which serves a definite aim in communication. A functional style should be regarded as the product of a certain concrete task set by the sender of the message. Functional styles appear mainly in the literary standard of the language. These represent varieties of the abstract invariant and can deviate from the invariant, even breaking away with it.FS is a relatively stable system at the given stage in the development of the literary language, but it changes, and sometimes considerably, from one period to another. Therefore FS is a historical category. Thus, for example in the 17 th century it was considered that not all words can be used in poetry, and that a separate poetic style exists. Later, in the 19 th century romanticism rejected the norms of poetic style and introduced new vocabulary to poetry. The development of each style is predetermined by the changes in the norms of standard English. It is also greatly influenced by changing social conditions, the progress of science and the development of cultural life. Every functional style of language is marked by a specific use of language means, thus establishing its own norms which, however, are subordinated to the norm-invariant and which do not violate the general notion of the literary norm. The writers of the given period in the development of the literary language contribute greatly to establishing the system of norms of their period. It is worth noting that the investigations of language norms at a given period are to great extent maintained on works of men of letters. Selection, or deliberate choice of language, and the ways the chosen elements are treated are the main distinctive features of individual style. Individual style is a unique combination of language units, expressive means and stylistic devices peculiar to a given writer, which makes that writer's works or even utterances easily recognizable . Naturally, the individual style of a writer will never be entirely independent of the literary norms and canons of the given period. But the adaptations of these canons will always be peculiar and therefore distinguishable. Individual style is based on a thorough knowledge of the contempo...
