Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to G. R. Mather Esquire Provides Mr. G. R. Mather with details of recent works on molecular physics, including, Sir J. J. Thomson's 'Electricity and Matter', works on Radio-dynamics by Rutherford, Soddy, Bragg and Kaye, and Clerk Maxwell's 'Electricity and Magnetism'. 6 December 1918