PKACTKAL LAWS ()]■ MIK ;^4;, 



Since tliesu pC()i)le arc a l»iir»k'ii ki iIil'Ium'Ivl's and lo 

 society, no right-niindod person could risk the responsibility 

 for bringino' them into the world : and as the i'acts come to 

 be generally known, all such streams of bad blood will U- 

 prevented from increasing thcii- kind and also from spread- 

 ing out to contaminate streams of normal blood. 



Color of eyes and hair, night blindness, eohu- blindness, 

 albinism, germinal deaf-nnitism, and many other human 

 characters have been found to follow MendeFs law, but dis- 

 covery is only beginning to break into this Held, and we 

 merely suggest it for future individual study. Mnsi impoi-. 

 tant studies have been made on typical streams of bad 

 heredity. Let different mend)ers of the class volunteer to 

 look up the following and report: "The Jukes Family," bv 

 Dugdale : ''The Zero Family," by .Uirger ; "The Hill Folk," 

 by Danielson and Daveniiort ; "The Nam Familv," l)V 

 Estabrook and Davenport ; and " The Kallikak Family," 

 by Goddard. 



