92 EXPLANATIONS. 



the old species had died out or been changed 

 There was nothing more in the " step" of our re- 

 viewer than this. Such is the geological doctrine. 

 " Is the present creation of life," says Professor 

 Phillips, " a continuation of the previous ones ; a 

 term of the same long series of communicated 

 being? I answer, yes."* " There is no break," he 

 says, " in the vast chain of organic development till 

 we reach the existing order of things." The reader 

 will further be able to judge of the candour of the 

 reviewer respecting the zoology of the tertiary, 

 when he is reminded that it shows exactly those 

 new portions of the animal kingdom which might 

 have been expected, according to the theory of 

 development. Heretofore, we have only few and 

 faint traces of mammalia ; but now they are added 

 in abundance, mammalia being the crowning class 

 of the vertebrated form. As far as class, therefore, 

 is concerned, it is incontestably a " regular plan 

 of organic development," But this is not all. 

 We have seen the reptile forms of the secondary 

 approaching the cetacean character; and now 

 there is an abundance of the aquatic mammalia, 

 as well as of those land pachyderms which are 



* He adds — "But not as the offspring is a continuation of the 

 parent." 



