Laboratory notebooks recording research in the physiology and biochemistry of reproduction. Includes some biographical material. All the notebooks have on their front covers Mann's labels which describe and date the work and these labels are reproduced in the catalogue entries. Additionally the notebooks were numbered 1 - 12 in red ink by Professor Mann before making them available for cataloguing. A further characteristic is the inscription, usually on the first page, ' [...] Szczesc Boze!' (God Bless) indicative of Mann's Polish origins and Catholic faith. The research recorded in these notebooks was carried out in Cambridge at the Molteno Institute and on visits to the USA. However, they do not form a complete set of the notebooks used by Mann for his research even for the period 1947-76.