VI 



A CRITICAL EXAMINATION OF THE POSITION OF 

 MR. DARWIN'S WORK, "ON THE ORIGIN OF 

 SPECIES," IN RELATION TO THE COMPLETE 

 THEORY OF THE CAUSES OF THE PHENOMENA 

 OF ORGANIC NATURE. 



IN the preceding five lectures I Lave endeav- 

 oured to give you an account of those facts, and 

 of those reasonings from facts, which form the 

 data upon which all theories regarding the causes 

 of the phenomena of organic nature must be 

 based. And, although I have had frequent 

 occasion to quote Mr. Darwin as all persons here- 

 after, in speaking upon these subjects, will have 

 occasion to quote his famous book on the " Origin 

 of Species," you must yet remember that, wher- 

 ever I have quoted him, it has not been upon 

 theoretical points, or for statements in any way 

 connected with his particular speculations, but on 

 matters of fact, brought forward by himself, or 

 collected by himself, and which appear incidentally 

 in his book. If a man vAll make a book, pro- 



