ACKNOWLEDGEMENTS 



I wish to acknowledge the great kindness of 

 Dr. L. Hussakof,at that time Cnrator of Reptiles 

 in the American Museum of Natural History, 

 New York for reading and correcting the first 

 ten chapters of this book, and for his many kind 

 words and deeds. When I offered to pay for the 

 trouble he wrote me "all the pleasure of being 

 helpful in an unselfish way would be gone if I 

 received pay." Dr. W. D. Matthews, Curator of 

 Vertebrates in the same Museum also encouraged 

 me greatly by hoping I would publish my ideal 

 picture Of "Ancient Giants" after reading the 

 chapter I sent him under that title. All the rest 

 I am responsible for, as I have had no assistance, 

 and if I hlive published any thing that does not 

 please my reader I hope they will overlook it. 



How can I thank the Director of the Geologi- 

 cal Survey of Canada, and Deputy Minister, Mr. 

 R. G. McConijiell, who has allowed me to use the 

 photographs taken by my sons George and 

 Charlie, to illustrate my pages. The text would 

 have been dull indeed without them. Neither 

 can I express my thanks for his unfailing kind- 

 ness to me while I was under his authority as a 

 member of the Survey. All the photographs (ex- 

 cept the Front P\ece Figures 1, 2, and 3, which 



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