Letter from Howard Walter Florey to E Clayton-Jones, Editor, The Lancet, Oxford Suggests that Clayton-Jones put his leader (about penicillin supplies) in general terms - gives draft paragraph - not necessary to mention financial side if emphasises that every effort is being made - is no standardised extraction method - discusses general administration of penicillin - paper by Abraham et al states that a crystalline product representing a substantial part of penicillin molecule has been found - is an amino acid - discusses it properties - definite advance in elucidating the structure of penicillin. 17 February 1943