Letters to Robert Robinson, surnames beginning Si - Sm Correspondence with the following: J C E Simpson, concerning a research paper (1944); Note from Berndt Sjoberg at the AB Astra Research Laboratories on preparation of AB 1341 (1961); Notes from S N Slater, regarding research, with a preprint of a paper on "Picrotoxin and Tutin" by Slater, R B Johns and R J Woods (nd, 1956); George F Smith, concerning research into chemical structures (1954, 1962). 1929-1962