Copies of letters regarding the drainage system of the gardens of the Zoological Society into Regent's Canal, with accompanying map
Letters from Alexander Agassiz to Philip Lutley Sclater about the collections of British Museum and Jardin du Plantes, Paris
Letter from Henry Francis Ainslie to Philip Lutley Sclater about plans for the erection by the Zoological Society of a new 'cats house or house for lions, tigers, and other large Felidae.'
Letters from James Anderson regarding a proposed Zoological Garden in Edinburgh, with a reply from Philip Lutley Sclater
Letters from Thomas George Baring to Philip Lutley Sclater regarding the Zoological Gardens at Calcutta
Letters from Gambier Bolton to Philip Lutley Sclater regarding alterations and additions to the gardens of the Zoological Society of London due to the decline in visitors
Letters from Arthur E Brown of the Zoological Society of Philadelphia, to Philip Lutley Sclater regarding the birth of an African elephant
Letter sent by G P Clifford to Philip Lutley Sclater regarding birds sent by the Otago Acclimatisation Society to the Zoological Society of London
Letter from George Mifflin Dallas to Philip Lutley Sclater regarding the proposal for a Zoological and Botanical garden in Central Park, New York
Letter from Charles Dickens to Philip Lutley Sclater sending thanks for the ticket for the gardens of the Zoological Society of London