Letter from Howard Walter Florey to L P Garrod, Pathology Department, St Bartholomew's Hospital, London Thanks for letter - discusses idea of repository for antibiotics - impossible to undertake this at Oxford - comments on this - cultural side could be arranged through institutions already devoted to this sort of thing - comments on difficulty of obtaining adequate samples of antibiotics for reference standard - often necessary to carry purification a long way before one can establish identity of substance with a previously described antibiotic - comments on this. 13 August 1959