The history by Ssŭ-ma Ch‘ien stops about 100 years before Christ. To carry it on from that point was the ambition of a scholar named Pan Piao (A.D. 3-54), but he died while still collecting materials for his task. His son, PAN KU, whose scholarship was extensive and profound, took up the project, but was impeached on the ground that he was altering the national records at his own discretion, and was thrown into prison. Released on the representations of a brother, he continued his work; however, before its completion he became involved in a political intrigue and was again thrown into prison, where he died. The Emperor handed the unfinished history to PAN CHAO, his gifted sister, who had been all along his assistant, and by her it was brought to completion down to about the Christian era, where the occupancy of the throne by a usurper divides the Han dynasty into two distinct periods. This lady was also the author of a volume of moral advice to young women, and of many poems and essays. [Sidenote: HSÜ SHÊN] Lexicography, which has since been so widely cultivated by the Chinese, was called into being by a famous scholar named HSÜ SHÊN (_d._ A.D. 120). Entering upon an official career, he soon retired and devoted the rest of his life to books. He was a deep student of the Five Classics, and wrote a work on the discrepancies in the various criticisms of these books. But it is by his _Shuo Wên_ that he is now known. This was a collection, with short explanatory notes, of all the characters--about ten thousand--which were to be found in Chinese literature as then existing, written in what is now known as the Lesser Seal style. It is the oldest Chinese dictionary of which we have any record, and has hitherto formed the basis of all etymological research. It is arranged under 540 radicals or classifiers, that is to say, specially selected portions of characters which indicate to some extent the direction in which lies the sense of the whole character, and its chief object was to exhibit the pictorial features of Chinese writing. FOOTNOTE: [10] Variant “firm,” _i.e._ was firmly laid. CHAPTER IV BUDDHISM The introduction of Buddhism into China must now be considered, especially under its literary aspect.