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.'
Letter from Cecil Charles Windsor to Philip Lutley Sclater requesting a press pass for the Gardens as he was illustrating a series of articles for the English Illustrated Magazine
Letter from John Alger to Philip Lutley Sclater ahead of his visit to Australia
Letter from Philip Lutley Sclater requesting the present address of George William Allan, who was proposed as a Fellow in March 1856
Letters from Morton Allport to Philip Lutley Sclater about the introduction of salmon to the waters of Tasmania
Letter from Leopold Charles Maurice Stennett to Philip Lutley Sclater offering to get anything he wished during his trip to South Africa, and thanking him for a recent zoo ticket
Letters from James Anderson regarding a proposed Zoological Garden in Edinburgh, with a reply from Philip Lutley Sclater
Letters from John Anderson to Philip Lutley Sclater regarding the Indian Museum in Calcutta