x.] PERSISTENT TYPES OF LIFE. 227 



applications of the great biological sciences/ and who 

 desires to see it placed upon the same sound basis as 

 other branches of physical inquiry. If the arguments 

 which have been brought forward are valid, probably no 

 one, in view of the present state of opinion, will be 

 inclined to think the time wasted which has been spent 

 upon their elaboration. 



