Bundle of correspondence between Pontecorvo and Professor Cyril Dean Darlington, Dr Joseph Grafton Gall, and Professor Harold Garnet ("Mick") Callan conerning Pontecorvo's decision to write up his "wild speculations about crossing over" and his request for Callan and Galls's contributions from the angle of lampbrush chromosome

Scope and Content

Also includes two photographs of "pepsin digested chromosome". Ball's letter dated 6 June 1955 is annotated with diagrams.