Letter from G V R Born, Royal College of Surgeons of England to Howard Walter Florey Thanks for photograph - gives details of experiment he performed on platelet aggregation, which showed clear cut fall in platelet count when adenosine diphosphate was infused - Poole, Hallam and Kay are to visit to discuss the in vitro work on aggregation - has just married again - comments on his wife and thanks Florey for his good wishes. 18 December 1962