Letters to Pontecorvo from Professor Hermann Joseph Muller thanking friends and colleagues who attended his 70th birthday celebrations or sent gifts and assuring everyone that he was in good health after his fainting spell

Letter to Pontecorvo from Professor Hermann Joseph Muller concerning Muller's comments on Joseph Alan Roper's paper (based on Pontecorvo's ideas) on allelism and its discussion of the "position effect" and his comments on another paper about radiation effects

Copy of a letter from Pontecorvo to Professor Hermann Joseph Muller asking for his comments and opinion on two of his two typescript draft papers and giving an update of Dr Joseph Alan Roper's work

Photographs of Pontecorvo with friends and colleagues at Loch Lomond in 1958 and in 1964, of attendees at a meeting at "The Burn" in 1964 and of Hermann Joseph Muller and his wife near Elk Lake in the USA, 1963

Carbon copy letter (found among H J Muller's correspondence and passed on to Pontecorvo) from Muller to Dr Alan William Greenwood, Director of the Insititute of Animal Genetics at the University of Edinburgh concerning Pontecorvo's thesis (1940)

Offprints and copies of articles by Hermann J. Muller, chiefly concerning mutation, and related articles and obituaries

Copies of letters between Charlotte Auerbach and Hermann Joseph Muller

Offprints and copies of articles by Hermann J. Muller, generally concerning the wider applications of science

Letter to Pontecorvo from Professor Charlotte ("Lotte") Auerbach thanking him for sending Dr Joseph Alan Roper's paper on biotin synthesis and commenting on the results and a copy of a letter from Professor Hermann Joseph Muller

Folder of Hermann J. Muller offprints, initialled by Charlotte Auerbach

Photographs of the 100th Genetical Society meeting in Cambridge on 30 June 1949 and of staff at the Institute of Animal Genetics at the University of Edinburgh

Selection of slides for a talk on the history of genetics

Photographs of Pontecorvo with friends and colleagues in Cold Spring Harbor 1946, and in Switzerland in 1953

Photographs of Pontecorvo with friends and colleagues in Cold Spring Harbor 1956, and at a meeting about Recombination, c1960

Pontecorvo guestbook