編號 No.：26 材質 Material：鋁 aluminium 尺寸 Size：1.20 × 1.20 cm 姓名章。印章侧面有民国国徽及三颗五星。據李約瑟日記，1943年9月10日購刻於蘭州，花費十圓，鋁來自被擊落的日本飛機。 Name seal. Li Danyao is another name adopted early by Joseph Needham, combining his surname (Li) with a pseudonym (Danyao). Dan means elixir and yao splendid, reflecting Joseph Needham’s early and growing interest in Chinese alchemy and Daoism. The seal is made of aluminium from a Japanese warplane, and was bought by Joseph Needham in Lanzhou, Gansu province on 10 September 1943. “Fri. 10th [Sept., 1943] ... aluminium (Japanese plane) seal for me, 20.” It is then added to the verso of the first page of the North-West diary.