Copy letter from Herbert Rix, to J Y W MacAlister, Royal Medical & Chirurgical Society, 20 Hanover Square, W. 'Dear Sir, In answer to your's of the 25th, I am sorry to say we cannot trace any manuscript by Marat among our Archives. I cannot positively deny that it is in our possession, as we have a certain amount of material of that period un-indexed; but all our principal manuscripts are indexed, and I do not think it likely that the manuscript is here. If you care to come and make a search, we will give you every assistance. Yours truly, Herbert Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 30 October 1893