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

• Reference:GB 248 UGC 198/3/1/50
• Dates of Creation:May 1955-Jun 1955
• Physical Description:
  7 letters, 2 photographs (14 pages)

• Scope and Content

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

• Personal Names

  Callan, Harold Garnet, 1917-1993, zoologist and cytologist,

  Darlington, Cyril Dean, 1903-1981, biologist, geneticist, and eugenicist,

  Gall, Joseph Grafton, 1928-, cell biologist,