THEODORE NICHOLAS GILL (1837-1914) SIGNED NOTE, “Theo. Gill/Aug. 6, 1906”, on a card 4 x 2.5, by the American ichthyologist (study of fish), mammalogist, malacologist (study clams and snails), and librarian. He was librarian at the Smithsonian Institute where he catalogued mammals, fishes, and mollusks; senior assistant to the Library of Congress; professor of zoology at George Washington University; and President of the Association for the Advancement of Science (1897). Besides 400 separate papers on scientific subjects, his major publications include: Arrangements of the Families of mollusks (1871), Arrangements of the Families of Mammals (1872), Arrangements of the Families of Fishes (1872), Catalogue of the Fishes of the East Coast of North America (1875), and Bibliography of the Fishes of the Pacific of the United States to the End of 1879 (1885). His short handwritten note, in full: “I send herewith ‘sentiment’ as desired.” The card is in excellent condition, with minor age toning.