Letter from Leonard [Erskine] Hill, The London Hospital Medical College (University of London), Turner Street, Mile End, London, to the Royal Society 'Dear Sir, I enclose a paper for the [Proceedings Royal Society]. The photograph mentioned in the paper p4 will be sent on in the course of a few days and we should like a full page block of it if possible. I am yours truly, Leonard Hill'. 25 January 1906