Letter from Theodore Koppanyi, Department of Pharmacology, Georgetown University, Washington DC to Howard Walter Florey, School of Pathology, Oxford Says in accordance with telephone conversation, they have arranged symposium for 28th and 29th October - informal dinner planned for 27th - hopes to send detailed programme in the spring - says Houssay, Heymans, Bovet and others are to participate. 20 February 1964