Letter from Howard Walter Florey to L T Poole, War Office Thanks for Hughes' report - gives detailed criticisms of Hughes' assay methods - Colebrook shoed that Lanette wax preparations did not keep well - should call attention to this - should hesitate to use preparations which have had a significant deterioration - discusses need to watch results put forward as the result of assays - comments on use of procaine with penicillin and statement to be issued on this. 2 May 1944