Fleming, Alexander, 1881-1955 (Scottish physician and microbiologist, discovered use of Penicillin as an antibiotic)

Case containing a colony of Penicillium notatum, the mould from which penicillin is derived.

Handwritten caption at the back: "The mould that makes Penicillin. To the S.R.C in memory of the "Rectorial". Alexander Fleming 1952" (the date was initially "1951", later corrected to "1952").