Correspondence between Melvin Calvin and the Royal Society General correspondence following Calvin's election as a Foreign Member of the Royal Society. Letters to and from the Foreign Secretary H G Thornton, and the Assistant Secretary, David Christie Martin. The original file featured the typed name and address: 'Professor M. Calvin, For. Mem. R.S., Department of Chemistry, University of California, Berkeley 4, California, U.S.A.'. 23 April-20 May 1959