Carbon copy of letter from J D Griffith Davies, Assistant Secretary to the Royal Society to Miss Deighton, The royal Institution ' In a letter which Sir William sent to Professor Egerton to-day it was stated that a letter from Bertram was enclosed. This did not come here; perhaps you would let me have it at your convenience. The other point in Sir William's letter I will bring to t he notice of Professor Egerton at once. ' 9 April 1940