Letter from Howard Walter Florey to H R Dean, Cambridge Discusses use of penicillin in syphilis - no objection to Blacklock having material to treat this - Gardner tested a leptospira which was insensitive and so Florey should regard syphilis research as something new - if organism sensitive and enough penicillin given, a good clinical result will be had - can let committee have most of his penicillin allowance - hopes synthesis will not be long delayed. 29 October 1943