HEREDITY IN MAN 373 



complex forms of Mendelian heredity have been demonstrated. 

 Human responses are of more interest than structures. These 

 are, however, based upon the structure and functions of various 

 organs, and for that reason have a heritable basis whose transmis- 

 sion from generation to generation is essentially the transmission 

 of the response. Mental defects and other undesirable qualities, 

 as well as unusual ability, are so transmitted. Many records are 

 available to prove these facts. While environment may have 

 some effect upon the progress of individuals, the power of man to 

 control his own environment is evidence that ultimate develop- 

 ment is largely the expression of the heritage. 



REFERENCES 



Kellicott, W. E., The Social Direction of Human Evolution, 1911. 



GoDDARD, H. H., The Kallikak Family, 1912. 



Davenport, C. B., "Heredity of Skin Color in Negro-White Crosses," Pub. 



Carnegie Inst., No. 188, 1913. 

 Davenport, C. B., "The Feebly Inhibited," Pub. Carnegie Inst., No. 236, 



1915. 

 Estabrook, a. H., "The Jukes in 1915," Pub. Carnegie Inst., No. 240, 1916. 

 Castle, W. E., Genetics and Eugenics, 1921. 

 Holmes, S. J., The Trend of the Race, 1921. 

 Shull, a. F., Heredity, 1926. 

 Gtjyek, M. F., Being Well-Born, 1927. 



