Leo the Lion (MGM) of its main studio logo for its 60th anniversary based on the print logo, with the ribbons in a golden color. Above the ribbons were the words "Diamond Jubilee", replacing the standard company name, and its font color was silver and below the ribboning was the phrase "Sixty Years of Great Entertainment". The "Ars Gratia Artis" motto was removed from inside the circle and replaced with the text "Metro-Goldwyn-Mayer/United Artists". The drama mask from the bottom had its surrounding laurels removed, and the mask itself was moved up a little so that an additional golden ribbon with the text reading
Artis Library library was able to stock its shelves. In 1881, librarian Gilles Janse compiled a catalogue of the Artis Bibliotheek’s collection holding 4,381 items. The Artis Bibliotheek grew to include more than 16,000 titles. From 1848 to 1995, the Zoological Society Natura Artis Magistra published the journal "Contributions to Zoology". All issues of this journal are now in the Artis Bibliotheek collection. Initially, Westerman kept many of the library’s items in his home; the collection, however, has been housed in its own building at the zoo since 1859. In 1868 the collection was moved to the building on the Plantage Middenlaan.