Letters from Joseph Henry of the Smithsonian Institute, to Philip Lutley Sclater regarding botanical specimens from the Zoological Society of London and specimens of South American birds to be named and described for the Smithsonian Institute
Letter requesting specimens of lizards from North Africa
Letters from Wilhelm Carl Hartwig Peters of the Museum Regium Zoologicum, to Philip Lutley Sclater regarding Huxley's paper, a sketch of the plan of the monkey house, plates, specimens in his possession, and his memoirs
Letters from Edward Pierson Ramsay, Curator of the Australian Museum, to Philip Lutley Sclater regarding the transportation of a ceratodus to the Zoological Society of London
Letters from Carl Jacob Sundevall, Director of the Royal Museum Stockholm, to Philip Lutley Sclater regarding specimens found in the Museum such as Galapagos birds
Letters from Sir Lawrence Alma Tadema regarding an unmounted lion's skin and a letter in support of an artist being allowed to study in the Zoological Gardens
Letter from the Secretary of the United Services Museum, accompanying two specimens of birds killed in Mexico and of a Scoter killed at Southampton. The letter asks the Zoological Society of London to inspect and return them
Correspondence between United States Lines and Geoffrey Marr Vevers regarding the transport of animals and museum specimens to Philadelphia on the Russell R. Jones