Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Sir William Crookes OM, PRS 'I am sorry to have given you the trouble of telegraphing; I fear I did not realise your note of Monday called for an answer. As you could not come, and there was nor any important business, the meeting o Officers was postponed. The only available members of the Glassworkers' Cataract Committee (three altogether) met at Sir William Abney's house to discuss a draft report which will be sent round to you: no other business was transacted beyond agreeing that further researches should be carried out into the pathological effect of heat rays.' 16 April 1915