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 Alexander Agassiz to Philip Lutley Sclater about the collections of British Museum and Jardin du Plantes, Paris

Copies of letters regarding the drainage system of the gardens of the Zoological Society into Regent's Canal, with accompanying map