IV PREFACE. 



elucidating the subject of Evolution, they give in- 

 creased scope and importance to the book itself. 

 Truly the late Dr. John W. Draper was right when, 

 at a mere glance, he said: ^'The subject (horses' 

 teeth) is so suggestive !" 



So far as Evolution is concerned, I can only repeat 

 what I said in the first Preface, namely, that it denotes 

 improvement, and that Nature's laws are immutable, 

 and to oppose them is as foolish as to beat the head 

 against a stone wall. 



Again, as said in the first Preface, I think I can say 

 now from experience that Special Works, on account 

 of the thoroughness with which they are usually pre- 

 pared, are growing in public favor (an opinion in 

 which so able a journal as The Syracuse (N. Y.) 

 Standard concurs), and that while General Works 

 have their advantages, thoroughness of detail is not 

 usually among them. 



W. H. C. 



New York, September, 1883. 



