THE 



AMERICAN NATURALIST 



A NEW FACTOR IN EVOLUTION. 



By J. Mark Baldwin. 



In several recent publications I have developed, from differ- 

 ent points of view, some considerations which tend to bring 

 out a certain influence at work in organic evolution which I 

 venture to call " a new factor." I give below a list of refer- 

 ences 1 to these publications and shall refer to them by number 

 as this paper proceeds. The object of the present paper is to 



<•„<■• .April 10. : 



