Letters from Spencer Fullerton Baird of Washington to Philip Lutley Sclater regarding ornithology

Letters from Arthur E Brown of the Zoological Society of Philadelphia, to Philip Lutley Sclater regarding the birth of an African elephant

Letters from William Henry Huxley to Philip Lutley Sclater regarding alligators of North America and other matters

Letters from Charles Kingsley to Philip Lutley Sclater regarding naturalists in Denver, Colorado, specimens for the Zoological Society of London, and the paper of the ex-governor of Trinidad

Letter from Samuel Pierpont Langley of the Smithsonian Institution to Philip Lutley Sclater regarding the establishment of a Zoological Park in the City of Washington

Letters from Sir Charles Lyell to Philip Lutley Sclater regarding the donations of a text regarding Charles Darwin to the Library of the Zoological Society of London, a list of books to be purchased for the Library, the foundation of a zoological society in Boston, Massachusetts, and a request from keepers to read books on natural history and the animals in their care

Notes by Julian Huxley on visits to the Zoological Gardens at New York (Bronx Park), Philadelphia, Washington DC, Paris (Vincennes), Hamburg, Berlin, Munich (Hellabrunn) and Frankfort, also the Aquarium at Chicago

Draft notes by Julian Huxley on visits to the Zoological Gardens at New York (Bronx Park), Philadelphia, Washington DC, Paris (Vincennes), Hamburg, Berlin, Munich (Hellabrunn) and Frankfort, also the Aquarium at Chicago

Edward George Boulenger spent three weeks in America where he visited and studied the aquaria, zoological parks and museums in New York and Chicago

Journal of voyages to the W Indies, S America, E Indies and China, Cape of Good Hope and St Helena, from 1823 to 1831, in the Barque Charles and H C Ship Berwickshire