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
Letter from Philip H Knight to Philip Lutley Sclater regarding his resignation as Fellow of the Zoological Society of London
Letters from Francis Knollys to Philip Lutley Sclater regarding a male kangaroo and an alligator to be sent from Sandringham to the Zoological Society of London
Letters from Christian Ferdinant Friedrich Krauss to Philip Lutley Sclater
Letters from Johann Ludwig Gerhard Krefft of the Australian Museum in Sydney, to Philip Lutley Sclater
Letter from Paul Krell to Philip Lutley Sclater regarding his subscription to the Zoological Society of London
Letter from Francis W Lambton to Philip Lutley Sclater regarding a reference for a gardener to work at the gardens of the Zoological Society of London
Letter from C L Landbeck to Philip Lutley Sclater