Letters from Alfred Russel Wallace to Philip Lutley Sclater regarding the purchase of a joint residential estate, extracts read at meetings of the Zoological Society of London, papers for the Proceedings of the Zoological Society of London and Natural Science, his publication on 'Monkeys - their structure, affinities and distribution', a shipment of birds for the Society, improvements to the Gardens of the Zoological Society of London, notes on the Umbrella Bird, his election as a Fellow, papers on marine mammals, opinions on theories by Darwin, Birds of Paradise, and a list of butterflies of Costa Rica

Letter from Edward Burton to say that he has discovered changes to a specimen on which he had prepared a draft paper. He suggests change of scientific name accordingly

Letter from Julien Francois Desjardins to Edward Charlesworth, Assistant Secretary of the Zoological Society of London, regarding the Proceedings of the Zoological Society of London and papers for publication

Letter from James Scott Bowerbank to Philip Lutley Sclater regarding copies of his recent papers

Letter from George Stewardson Brady to Philip Lutley Sclater regarding contributions to the Proceedings of the Zoological Society of London

Letter from Octavius Pickard Cambridge to Philip Lutley Sclater requesting to include a paper in the Proceedings of the Zoological Society of London

Letters from John Willis Clark to Philip Lutley Sclater regarding his subscription and a paper for the Zoological Society of London

Letter from Benjamin Clarke to Philip Lutley Sclater regarding publications of the Zoological Society of London

Letters from Robert Oliver Cunningham to Philip Lutley Sclater regarding his research and other papers

Letter from Thomas Davidson to Philip Lutley Sclater regarding his paper on recent Japanese species of Brachiopoda