INTRODUCTORY AND EXPLANATORY XI 



highest quality, but a few are by Mr. Gleeson, with the aid 

 of Mr. Knight's criticism. 



The endeavor has been made to indicate, at the end of 

 each chapter, the museums in which the best examples of 

 the animals described may be seen, and also some book or 

 article in which further information may be obtained. As 

 this book is intended for the general reader, references to 

 purely technical articles have, so far as possible, been 

 avoided, and none in foreign languages mentioned. 



For important works of reference on the subject of 

 palaeontology, the reader may consult "The Age of Mam- 

 mals in Europe, Asia and North America," by Henry 

 Fair field Osborn, "A History of Land Mammals in the 

 Western Hemisphere," by W. B. Scott, and "Dragons of 

 the Air," by H. C. Seeley. Of a popular nature is a new 

 edition of "Extinct Monsters and Creatures of Other 

 Days," by H. N. Hutchinson, "Extinct Animals," by 

 E. Ray Lankester, and "Mighty Animals," by Miss 

 Jennie Irene Mix, intended especially for the young. 

 Interesting books on the collecting of fossils are " The Life 

 of a Fossil Hunter," by C. H. Sternberg, and "Hunting 

 Extinct Animals in the Patagonian Pampas," by F. B. 

 Loomis. No account is taken here of the numerous tech- 

 nical papers, dealing with new species, or increased knowl- 

 edge of the structure, habits and relationships of long known 

 species that appear in scientific journals or are issued by 

 our larger museums. 



The story of Primitive Man is a subject by itself and 

 is not touched upon in this book. It is related at length in 

 "Men of the Old Stone Age" by Henry F airfield Osborn and 

 briefly sketched by the same master hand in the "Hall of 

 the Age of Man," a Leaflet intended for use with the col- 

 lections displayed in the Museum. 



