_The best collection of fossil horses, and one specially arranged to illustrate the line of descent of the modern horse, is to be found in the American Museum of Natural History, New York, but some good specimens, of particular interest because they were described by Professor Marsh and studied by Huxley are in the Yale University Museum. They are referred to in Huxley's "American Addresses; Lectures on Evolution." "The Horse," by Sir W. H. Flower, discusses the horse in a popular manner from various points of view and contains numerous references to books and articles on the subject from which anyone wishing for further information could obtain it._ [Illustration: Fig. 35.--The Mammoth. _From a drawing by Charles R. Knight._] X THE MAMMOTH "_His legs were as thick as the bole of the beech, His tusks as the buttonwood white, While his lithe trunk wound like a sapling around An oak in the whirlwind's might._" _In the October number of McClure's Magazine for 1899 was published a short story, "The Killing of the Mammoth," by "H. Tukeman," which, to the amazement of the editors, was taken by many readers not as fiction, but as a contribution to natural history. Immediately after the appearance of that number of the magazine, the authorities of the Smithsonian Institution, in which the author had located the remains of the beast of his fancy, were beset with visitors to see the stuffed mammoth, and the daily mail of the Magazine, as well as that of the Smithsonian Institution, was filled with inquiries for more information and for requests to settle wagers as to whether it was a true story or not. The contribution in question was printed purely as fiction, with no idea of misleading the public, and was entitled a story in the table of contents. We doubt if any writer of realistic fiction ever had a more general and convincing proof of success._