Letters from Robert Oliver Cunningham to Philip Lutley Sclater regarding his research and other papers
Letter from Robert Blake White to Philip Lutley Sclater regarding his research into tapirs
Letters from John Samuel Budgett to Philip Lutley Sclater regarding his research on okapis and expeditions to study polypterus
Letters from George John Romanes to Philip Lutley Sclater regarding research into whether mutilations are ever inherited and Weismann's theory of heredity
Letters from Charles Telfaire to Nicholas Aylward Vigors regarding his research on the Dodo, a tortoise from the Seychelles, tortoises of the Amirante Islands and Mombasa, and a Chamaeleon from the north of Madagascar to be presented to the Zoological Society of London
Letters from Henry Walter Bates to Philip Lutley Sclater regarding his research and animals collected by Paul Du Chaillu