Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Hector A. Colwell Esquire; X-Ray Department of King's College Hospital, Denmark Hill, S.E.5. Informs Mr. Hector A. Colwell that his application to reproduce the portrait of Sir William Crookes from the 'Proceedings' in his 'History of Electrotheraphy' was recently laid before Council who have granted him permission, subject to the usual acknowledgements being made. 29 April 1921