BY THE SAME AUTHOR 



A History of Land Mammals in the 

 Western Hemisphere 



With many illustrations made from paintings by W. B. Horsfall 

 and others 



Decorated cloth, 8vo, $5.00 



For nearly half a century a constant and ever-widening stream 

 of discovery has brought to light a multitude of the animal forms 

 which successively inhabited North and South America, but long 

 ago vanished from the earth. This wonderful mammalian history 

 has been slowly and laboriously deciphered by many workers, and 

 the results of their investigations are scattered widely through the 

 scientific journals of nearly every European language and are thus 

 inaccessible to the general educated public. It is highly desirable 

 to bring together the more significant of these results in a form 

 which shall be intelligible to the reader who is interested in the 

 progress of science, but cannot make use of technical papers. 

 After a discussion of the methods of investigation, a sketch is 

 given of the geographical history of the western hemisphere and 

 of the mammalian groups which successively inhabited it. This 

 is followed by a series of chapters dealing with the evolution of 

 those land mammals whose history is known, and finally are 

 described the inferences as to the operation of the evolutionary 

 process which may be drawn from the study of these histories. 

 The numerous illustrations by Mr. Bruce Horsfall and Mr. 

 Charles Knight make the marvellous tale of development clear 

 with a minimum of technical description. 



THE MACMILLAN COMPANY 



Publishers 64-66 Fifth Avenue New York 



