Letter to Pontecorvo from Professor Peter Brian Medawar expressing his shock at the problems Pontecorvo was having with confirming the terms and conditions of the Arthur Balfour Chair of Genetics

Copy of a letter from Pontecorvo to Professor Sir Peter Brian Medawar about meeting up during his visit to London for a Mycological Society meeting in the London School of Hygiene and Tropical Medicine

Letter to Pontecorvo from Professor Sir Peter Brian Medawar concerning his proposals for a Biometry Chair

Copy of a letter from Pontecorvo to Professor Sir Peter Brian Medawar concerning financial matters relating to the Arthur Balfour Professorship at Cambridge

Correspondence between Pontecorvo and Professor Peter Brian Medawar concerning Pontecorvo's decision to accept the job at the Albert Einstein College of Medicine

Bundle of correspondence between Pontecorvo and Sir Peter Brian Medawar concerning the offer of position of Head of the new Division of Genetics and Developmental Biology

Letter to Pontecorvo from Professor Sir Peter Brian Medawar giving him an update on the proposed Chair of Biometry at University College, London

Large bundle of correspondence between Pontecorvo, Professor Sir Peter Brian Medawar, Sir William Kershaw Slater, and Professor Thomas A Bennet-Clark

Photographs of Pontecorvo with friends and colleagues in Cold Spring Harbor 1956, and at the 100th meeting of the Genetical Society at Cambridge, 1949

Letters from friends and colleagues congratulating Pontecorvo on his Royal Society Fellowship

Correspondence chiefly about research topics