This file contains 2 photocopy letters written in Chinese from Hu Tao-Ching to Joseph Needham and 2 photocopy letters from Joseph Needham to Hu Tao-Ching. These letters relate to research on acupuncture and compounds for anaesthetic and analgesic purposes, progress with Science and Civilisation in China and requests for books and periodicals for the library. The file includes an original booklet 目录 from 1992.