Letter from Carl Hagenbeck to Peter Chalmers Mitchell regarding his shipment of a buffalo to the Zoological Society of London
Letter from Victor Alexander Haden Horsley to Peter Chalmers Mitchell regarding arrangements made in the Zoological Society in the way of recording the wants of workers as regards material, and his desire to acquire the brain of a Hyrax
Letter from Mira F Layard to Dr Woodward regarding tool making animals
Letter from Mrs E E Mappin regarding the estate of John Newton Mappin and authorising the payment for completing the work on the Mappin Terraces at the Zoological Gardens
Letters from Lionel Nathan de Rothschild to Peter Chalmers Mitchell regarding his membership of the Zoological Society of London
Letters from Edwin Linley Sambourne to Peter Chalmers Mitchell regarding the Bear Pit at the Gardens of the Zoological Society of London and his admission to the Gardens
Letter from Frederick Courteney Selous to Peter Chalmers Mitchell regarding his election to the Fellowship of the Zoological Society of London
Letter from J A Shepherd to Peter Chalmers Mitchell requesting a student ticket giving permission to sketch the animals at the Gardens of the Zoological Society of London
Letter from Arthur Smith Woodward to Peter Chalmers Mitchell regarding 'the Minchin case' and the investment of £250 in Exchequer Bonds under the control of the Secretary of the Zoological Society of London
Letters, newspaper clippings and will of Herbert Spencer. The Zoological Society of London was one of 12 scientific societies which were beneficiaries of his estate