Letters from Richard Gibbons to David William Mitchell regarding his subscription to the Zoological Society of London
Letters from Hunter and English to David William Mitchell regarding a steam engine and pumping machinery at the Gardens of the Zoological Society of London
Correspondence between West Middlesex Waterworks and David William Mitchell regarding the consumption of water at the Gardens of the Zoological Society of London
4 letters from unknown authors to David William Mitchell regarding membership of the Zoological Society of London, a large blood hound for the Society and the transportation of animals
Letters from Alexander Agassiz to Philip Lutley Sclater about the collections of British Museum and Jardin du Plantes, Paris
Letters from John Anderson to Philip Lutley Sclater regarding the Indian Museum in Calcutta
Letters from Thomas George Baring to Philip Lutley Sclater regarding the Zoological Gardens at Calcutta
Letters from Frank Evers Beddard to Philip Lutley Sclater regarding the cause of death of a giraffe in the Zoo, his appointment as Vice-Secretary, meetings of the flower memorial committee, the death of a calf of Sanger's elephant, the death of the Nasalis larvatus, the purchase of a Langur, a collection of plants, and his position as Prosector
Letter from George Stewardson Brady to Philip Lutley Sclater regarding contributions to the Proceedings of the Zoological Society of London
Letters from Alfred Edmund Brehm to Philip Lutley Sclater