This letter was written from the Peking Hotel. Joseph Needham describes meetings and visits, preparation for articles in Nature, preparations for the report, purchasing books with the entomologist Chu Hung-Fu [Zhu Hongfu 朱弘复], the purchase of a seal made of rock crystal (see NRI2/5/15/3/6). There are two signed copies; one was sent to Lu Gwei-Djen to reach Dorothy Needham at the Biochemical Congress