PUBLISHER'S NOTE 



This book is a natural outgrowth of Professor Pearse's book, "The Mi- 

 grations of Animals from Sea to Land," pubhshed in a very hmited edition 

 in 1936 by the Duke University Press. Although much of the text remains 

 the same, many additions and corrections have been made, the bibliographic 

 references and the material have been brought up to date, and the illus- 

 trations added. Because of this, and the change in title which reflects a 

 slightly different theme, it is felt that the book can hardly be called a 

 second or a revised edition. 





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