| Description | Pleased Coghill's units (penicillin) seem to be the same as his - asks if Coghill is using the ring method of testing - dilution method gives higher reading with purer material - has extracted crystalline substance from Aspergillus fumigatus mut helvola - discusses penicllamine - ICI are getting good yields with lactose medium.
On verson of letter from Coghill to Florey, 26 March 1943. |