PHENOMENA OF INHERITANCE 



297 



III. Mendelian Inheritance in Man 



The study of inheritance in man must al- 

 ways be less satisfactory and the results less 

 secure than in the case of lower animals and 

 for the following reasons: In the first place 

 there are no "pure lines" but the most compli- 

 cated intermixture of different lines. In the 

 second place experiments are out of the ques- 

 tion and one must rely upon observation and 



Fig. 64. Mulatto husband and wife and their seven children 

 ranging in color from the one on left who "passes for white" 

 to th6 youngest who is typically black. (From Davenport.) 



