1) Language change is one of the subjects of historical linguistics, the subfield of linguistics that studies language in its historical aspects.

2) Comparative linguistics is a branch of historical linguistics that aims to study the relationships or correspondences between two or more languages and especially the differences they have.

3) By the historical linguistics, the thesis poses the origin and flowing direction of Xiajiasi , and also , it reveals the origin the reason why Xiajiasi had so many names.

4) "Grammaticalization" is an important topic in historical linguistics. It reflects the process of words or structures changing to be functional components.

5) "Grammaticalization" is an important topic in historical linguistics. It reflects the process of words or structures changing to be functional components. This paper focuses on the Chinese suffix tou.

6) Grimm's major contribution to historical linguistics is his explanation of the relationships among cognates in terms of a sound shift, the systematic modification of a series of phonemes.

7) Historical linguistics is the subfield of linguistics that studies language change.

8) Comparative method is the one that studies the difference between dialects and cognate language in order to find their developing law. Historical linguistics takes it as the base.

9) In the determination of the central meaning of a polysemous word the lexicographer is helped by historical linguistics.

10) The first results point the way toward a rigorous, quantitative, historical linguistics.

11) This paper demonstrates new horizons in the field of historical linguistics,(http:///historical linguistics.html) brought about by new development in relevant research fields.

12) The writer illustrates their developing process and reason at the base of phonology, historical linguistics and phonetics, and discusses on the phonological motivations and rules order for change.

13) This paper aims at analyzing the relationship between the Arabian writing system and Islamic culture from the perspective of the historical linguistics.