30. Skull of Phororhacos Compared with that of the Race-horse Lexington 151 31. Leg of a Horse Compared with that of the Giant Moa 152 32. The Three Giants, Phororhacos, Moa, Ostrich 158 33. Skeleton of the Modern Horse and of His Eocene Ancestor 161 34. The Development of the Horse 168 35. The Mammoth _From a drawing by Charles R. Knight._ 176 36. Skeleton of the Mammoth in the Royal Museum of St. Petersburg 183 37. The Mammoth _As engraved by a Primitive Artist on a Piece of Mammoth-Tusk._ 196 38. Tooth of Mastodon and of Mammoth 199 39. The Missourium of Koch _From a Tracing of the Figure Illustrating Koch's Description._ 207 40. The Mastodon _From a drawing by J. M. Gleeson._ 210 41. The Lenape Stone, Reduced 219 _INTRODUCTORY AND EXPLANATORY_ _At the present time the interest in the ancient life of this earth is greater than ever before, and very considerable sums of money are being expended to dispatch carefully planned expeditions to various parts of the world systematically to gather the fossil remains of the animals of the past. That this interest is not merely confined to a few scientific men, but is shared by the general public, is shown by the numerous articles, including many telegrams, in the columns of the daily papers. The object of this book is to tell some of the interesting facts concerning a few of the better known or more remarkable of these extinct inhabitants of the ancient world; also, if possible, to ease the strain on these venerable animals, caused by stretching them so often beyond their due proportions._ _The book is admittedly somewhat on the lines of Mr. Hutchinson's "Extinct Monsters" and "Creatures of Other Days," but it is hoped that it may be considered with books as with boats, a good plan to build after a good model. The information scattered through these pages has been derived from varied sources; some has of necessity been taken from standard books, a part has been gathered in the course of museum work and official correspondence; for much, the author is indebted to his personal friends, and for a part, he is under obligations to friends he has never met, who have kindly responded to his inquiries. The endeavor has been conscientiously made to exclude all misinformation; it is, nevertheless, entirely probable that some mistakes may have crept in, and due apology for these is hereby made beforehand._