Letters from Sir Henry Keppel to Philip Lutley Sclater regarding the localities of the animals he sent to the gardens of the Zoological Society of London, and giving thanks for a card of admission to the gardens
Letters from James Kerr to Philip Lutley Sclater regarding the paper his son wrote for the Ibis, and the voyage of the Bolivia to Paraguay
Letters from Sir John Graham Kerr to Philip Lutley Sclater regarding lists of birds, his degree course, his collection of birds, and papers
Letter from W A Kerr to Philip Lutley Sclater resigning from the Fellowship of the Zoological Society of London
Letter from Otto Kersten to Philip Lutley Sclater regarding his East African exploring project
Letter from C W Killingback & Co to Philip Lutley Sclater regarding the construction of a main sewer from Albany Street to the Zoological Society of London
Letter from Martha King to Philip Lutley Sclater regarding her subscription to the Zoological Society of London
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 Richard Kippist, the Librarian of the Linnean Society of London, to Philip Lutley Sclater regarding the costs of meeting for scientific business at the Linnean Society
Letter from Horatio Herbert Kitchener to Philip Lutley Sclater regarding a rare wild cat at Dixon Bay for the Zoological Society of London