Papers -- Safe Doses of Toxins Contains working papers of J H Gaddum related to the method of determining the safe dosage for toxic substances. Includes a letter from Gaddum to A C Aitken, requesting help with two enclosed documents (item 1); the documents, a paper on 'The Estimation of a Safe Dose' (item 3) with a subscript on estimating the error of this estimate (item 2); A C Aitken's response pages (items 4-5); offprint of an article by J M Barnes and F A Denz on the reaction of rats to toxic substances (item 6); a table on the safe doses of antimalarials (item 7); 16 pages of data on toxicity experiments with graphs and calculations (item 9); offprint on chemical potentials as indices of toxicity, by J Ferguson (item 10). 1950s