Letter from Howard Walter Florey to L T Poole, War Office Says he is not clear what surgeons are anxious about in the penetration of the peritoneal cavity - difficult to prove - suggests experiment with guinea pig - says his wife is interested in absorption and distribution from the peritoneal cavity - says penicillin will get out if peritoneum is inflamed and vessels are permeable - not worth doing punctures to ascertain if normal peritoneum passes it. 30 June 1945