H, W. Conn 371 



effects of use and disuse, to certain organisms ? In answer to 

 this it is apparent that its influence will be more extended than 

 the action of use and disuse, and more extended than the limits 

 of consciousness. Wherever acquired variations occur, organic 

 selection will apply. Wherever environment, either food, 

 cHmate, or conscious action, produces direct modifications of 

 the body of animal or plant, these acquired variations will aid in 

 preserving the individual until the proper congenital variations 

 appear. Organic selection would therefore seem to apply 

 wherever the environment produces a direct adaptive variation 

 in the body of the individual."^ 



" Organic selection must undoubtedly be regarded as a factor 

 in the evolution of species. This is granted on all sides. In 

 the study of the history of man it becomes of extreme signifi- 

 cance, but this subject cannot be considered in this work." 



1 Cf. the note on p. 360, above. — J. M. B. 



