“科学学”有一条规律:“比较增进知识,分类形成系统。”这条规律说明了多种学科的发展历程,尤其是初期的发展历程。生物学、语言学等等,都是从比较起步,逐渐深入,然后发展成熟的。比较语言学起步早,已经成为一门老学问了。比较文字学起步晚,还停留在初期阶段。一千九百年前,许慎著《说文解字》,开创了汉字学。他用六书解说汉字。六书是用比较方法 “Science ” There is a law: “This is a comparatively enhanced knowledge, classification system. ” This rule illustrates the development of a variety of disciplines, especially the early course of development. Biology, linguistics, etc., are from the comparative start, gradually in-depth, and then mature. Compared to linguistics started early, has become an old learned. Literary learning started late, still stay in the early stages. Nineteen hundred years ago, Xu Shen’s “Explain Word,” created the Chinese study. He uses six books to explain Chinese characters. Six books are by comparison