Letters from Decimus Burton to Edward Turner Bennett regarding his brother's giraffe, the location of the parrot cage, drawings of the museum, the risk of fires, and the meeting of the creditors of the Colosseum
Correspondence between Julian Sorell Huxley and Tecton Group regarding the construction of the new Elephant House
Copies of letters regarding the drainage system of the gardens of the Zoological Society into Regent's Canal, with accompanying map
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 Abraham Dee Bartlett to Philip Lutley Sclater regarding the doors to the new elephant house, animal food consumption, the female rhinoceros, the mounted specimen of a young gorilla, authorisation to sell Alice the elephant to Mr Barnum, and the theft of an owl
Correspondence between Julian Sorell Huxley and Stanley Reed regarding The Maharajah of Bhavnagar, plans for a new Elephant House at the London Zoological Gardens and a a request for a financial contribution from The Maharajah
Correspondence between the Royal Institute of British Architects and Julian Sorell Huxley regarding a list of Rice contracts
Letters from David Seth-Smith to Julian Sorell Huxley regarding plans for the proposed new Elephant House and meetings of the Elephant House Committee