On publishing the papers of the three symposia (Jaques Cattell Press) at the Dallas meeting of the American Association for the Advancement of Science. Attached a 2-page list of the three synposia: 'The Genetic Control of Embryonic Development' (Chair: B. H. Willier); 'Symposium on Isolating Mechanisms'; 'Symposium on Temperature and Evolution'.Typewritten with short handwritten note on the death of Spemann.3-page letter