Letters from John Trivett Nettleship to Philip Lutley Sclater regarding admission to the Gardens of the Zoological Society of London, a recommendation for Miss Mary Irene Stoddard to receive a student ticket for admission, and a letter to Professor Flower regarding his proposed election as Fellow
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
Letters from Christian Ferdinant Friedrich Krauss to Philip Lutley Sclater
Letters from Sir Richard Owen to Philip Lutley Sclater on subjects such as plates of the Dodo, papers on bird bones, notes on the dissection of a penguin, cetacean drawings, chambered shells, drawings of birds from Madras, photographs of harpagornis and his papers on diornis
Letters from Arthur Walden, Marquess of Tweedale, to Philip Lutley Sclater regarding an offer from the Duke of Wellington of two male llamas, Fellowship of the Zoological Society of London, specimens of an insect, and subscriptions to the Society