The following study indicates the rudimentary approach to Duan Yu-cais'assumption of xiesheng characters, gu-xiesheng-shuo. In this paper, the author examines relatiens between rimes of Shijing and xiesheng characters in the 15th Archaic rime category assumed by Duan Yu-cai (abbr. the 15th rime category), in order to find the clue to consider the duplication the xiesheng characters between the Ji Archaic rime category and the Zhi Archaic rime category which is pointed out in Rai (1983).
The main procedure of this study is following:
a. dividing the rusheng rimes of the 15th rime category into two, i. e. the Ji Archaic rime category and the Zhi Archaic rime category.
b. judging the xiesheng characters from the rimes of the 15th rime category, according to
Shuowen-Jiezi-Yinyun-Biao edited by Jiang Yuan who was one of the Duan's pupils.
Through this study, it is concluded that the concept of chusheng is the clue to consider the xiesheng characters of the Ji Archaic rime category.
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