66 



terrestrial. But there is an exception, which, as usual proves 

 the rule ; and, pursuing the consequences legitimately to be 

 deduced from the above facts, we may, perhaps, be able to 

 arrive at the true reason for marine animals, warm-hlooded^ 

 like whales, having been called into existence so late, when 

 their proper food, Mollusca and Crustacea, had, for ages 

 before the earliest tertiary period, abounded in the waters 

 which then covered a great part of the face of the earth. 



Kemp and Fairfax, Printers, Lower George-street, Sydney. 



