1. GARROD, L. P. and HEATLEY, N. G. (1944).-Brit. Ji. Surg., Penicillin Number, P. 117.
2. * Thesis for M.D. submitted'to Aberdeen University, August 15, 1945.
3. Abstract of above received for publication,1945
4. b) Different strains of the same organism. Penicillin sensitivity varies widely with different strains of the same organism. This has been confirmed by Bentley and Thompson;in all cases, showing that,1945
5. c) Adaptation. Acquired resistance to penicillin has been described by 'Abraham et alia,1941