Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to H. T. Wilkins Esq.; Crowhurst Road, Brixton, S.W.9. In reply to H. T. Wilkins' enquiry, regrets that he cannot be lent the photographs of the katharometer experiments, as exhibits shown at the Royal Society Soiree are property of the exhibitors. Suggests Wilkins write to Dr Leonard Hill FRS. 21 May 1925