Letters from John Edward Gray regarding John Gould's collection of birds and his subscription to 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
Letters from William Hill and Co. to David William Mitchell regarding the price for an engine and boiler at the Zoological Society of London
Letter from Sir George Cornewall Lewis to David William Mitchell regarding the Treasury not being prepared to purchase the collection of the Museum of the Zoological Society of London
Letters from Sir Richard Owen to David William Mitchell regarding the cost of keeping elephants, his attendance at meetings of the Council of the Zoological Society of London, and his consent to act as Vice President
Letters from Sir Charles Beaumont Phipps to David William Mitchell regarding Prince Albert
Letter from Sautet and Robinet to David William Mitchell regarding the destruction of insects in the Gardens of the Zoological Society of London
Letters from Alexander Shaw to David William Mitchell regarding tigers from Bombay sent to the Zoological Society of London
Correspondence between Edward Smith-Stanley, Earl of Derby, and David William Mitchell regarding a list of desirables from the sale catalogue of the aviary and menageries at Knowsley Hall
Letter from the Societe Royal d'Histoire Naturelle de Gand to David William Mitchell regarding the payment for delivery of animals