Copy letter from Robert William Frederick Harrison, to John Stanley Gardiner 'Dear Sir, A second schedule is enclosed herewith. Lantern demonstrations are given in the Meeting Room at the Soirees, and we are in fact now making arrangements about these "lecturettes". For the present, it would be convenient to make a note of your kind offer, and arrive at a decision somewhat later. Yours faithfully R Harrison Asst Sec RS [Assistant Secretary, Royal Society]'. 10 April 1906