Notebook cover marked 'S.O Book 124 Supplied for the Public Service'.

The volume is undated, although it contains references to Alan Robertson, George Clayton and Forbes Robertson, all of whom were working in the Institute of Animal Genetics in the 1950s. Clayton and Alan Robertson collaborated on Drosophila work from 1953 onwards, so it is likely that this volume dates from around this period. It appears from the notes that Waddington was collecting data on mutant strains from his colleagues, and setting them questions to answer.