Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to H. Robotham Esq., 48 Lillieshall Road, Clapham, S.W.4 Letter stating that strangers have to be introduced to meetings of the Royal Society by a Fellow of the Society but that if Mr. Robotham wishes to hear Professor Moore's paper read, a Fellow can be found to introduce him 28 January 1918