Letter from Howard Walter Florey to Edward Mellanby, Medical Research Council, London Says Wallersteiner proposes publishing a book on penicillin - supposed to be a chemical, technological and biological reference work - discusses implications in view of curbs on publication - possible complications if someone involved in a doubtful proposition like vivicillin were allowed to publish confidential material - Florey and Chain's book will not be published until secrecy lifted. 13 February 1945