Letter from [Peter] Chalmers Mitchell, Secretary of the Zoological Society of London, 3 Hanover Square, to the Assistant Secretary of the Royal Society, Burlington House 'Dear Mr Harrison, I find that we have not a copy of Ledenfeld's "monograph of the horny sponges' in our Library. Mr [?] has suggested to me that if I were to apply to you, you might be able to obtain a presentation copy for us. Yours very truly, P Chalmers Mitchell'. Enclosed is a note stating they have a large number in stock of the Ledenfeld monograph. [For reply, see related records.] 8 December 1904