Agreement and schedule of conditions of building contract between ZSL and Messrs Wackett Bros. (Demolitions) to carry out the demolition and site clearance of the Hippopotamus House including public areas, annexe to the Giraffe House and entrances

Letters from Sir Frederick William Adolphus Bruce to David William Mitchell regarding the gift of a female hippopotamus from Egypt for the Zoological Society of London

Correspondence between Hamet Saffi Canaana, the Keeper of Obaysch, and David William Mitchell regarding his service at the Zoological Society of London, with receipts

Correspondence with Martin Charteris regarding a Pygmy Hippopotamus from President Tubman

Correspondence between G Fitzgerald-Lee and George Soper Cansdale regarding the Hughes Expedition and an offer to sell a female African Pygmy Hippopotamus to the Zoological Society of London

Letter from John Green to David William Mitchell regarding the transport of the hippopotamus on the 'Ripon' for the Zoological Society of London

Letters from Robert Hesketh to David William Mitchell regarding an estimate of work done to animal houses and enclosures at the Zoological Society of London, including the Terrance Dens and the Hippopotamus House

Composer: L. St Mars

Composer: J A Hardwick

Letter from E H Tong regarding snow drifts at Whipsnade, the arrival of a female Pygmy Hippo presented to The Queen, and a parasite that had been causing trouble in the Grevy's Zebra