1892.] The Contemporary Evolution of Man. 481 



It is evident at once, from a glance over the facts brought for- 

 ward in this lecture, that the first theory is the simplest expla- 

 nation of these facts ; that use and disuse characterizes all the 

 centers of evolution ; that changes of structure are slowly fol- 

 lowing our changes of function or habit. 



But while the first explanation is the simplest it by no 

 means follows that it is the true one. In fact, it lands us in 

 many difficulties, so that I shall reserve the pros and cons for 

 my second lecture upon Heredity. The Lamarckian theory is 

 a suspiciously simple explanation of such complex processes. 

 (To be continued.) 



