The significance of the Neo-grammarians in the history of linguistics;

Jakobson s linguistic thoughts have directly originated from Peirce s semiotics,which,in a sense,illustrates the important role played by Peirce in the history of linguistics.

Through the analysis of the most influential schools-rationalism and empiricism in linguistic history in 17th and 18th century,the author attempts to review the development of western linguistic history and explore the role and function of rationalism in the development history of linguistics.

This paper attempts to review the western linguistic history from the angle of rationalism and explore the rol.

de Saussure, it analyzes some problems of linguistic historiography and suggests four areas of improvement.

The thesis discusses the linguistic material which shows in five aspects: the research on the dialect,the study on difficult words,the explanation to the character of ancient books,the research on the specific expression and the study on appellations.

With the help of the historical linguistics the Chinese traditional linguistics broke away from the old background.

Trough the methodology development of the historical linguistics, we can investigate the model of Chinese dialect phonetic change.

The reason is that the study of Chinese dialects affects the fields of phonetics, phonology, grammar, semantics, historical linguistics, philology, socio-linguistics and language change.