Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr W. G. Black, CBE; Carlton Club, Pall Mall, S.W.1. In reply to Dr W. G. Black's letter, informs him that it will not be necessary for him to produce any credentials other than his private visiting card at the Bureau here when he comes for the Lister Centenary Celebrations. 29 March 1927