The aim of this book is to interest young people 

 in the life that was lived on this earth before man 

 appeared. 



Of the many wonderful animals which lived 

 during that period in the earth's history only some 

 of the most striking among the gigantic types 

 are discussed. For information to be found in 

 books regarding these animals, the author has relied 

 chiefly on two works by Frederic A. Lucas, "Ani- 

 mals of the Past" and "Animals before Man in 

 North America: Their Lives and their Times"; 

 "Extinct Animals" by Sir Edwin Ray Lankester; 

 "Age of Mammals in Europe, Asia, and North 

 America," by Henry Fairfield Osborn; "Extinct 

 Monsters," by Henry Neville Hutchinson; and 

 "The Mammoth and the Flood," by Sir Henry H. 



5 



