HUMAN LIFE 



eralizations as Gallon's but it makes 

 much more precise ones. It does not 

 treat of halves or quarters or eighths of 

 one's whole inheritance but of the inheri- 

 tance of specific characters, as hair-form, 

 eye-color, susceptibility or resistance to 

 particular disease, and feeble-mindedness. 

 I am talking of human traits and human 

 heredity now. Among plants it treats 

 of leaf shape, flower pattern, height of 

 stem, and other characters. Among 

 silkworms it treats of larval coloration 

 and pattern, color of cocoon, number of 

 generations a year, and others. And so 

 on. I might make a long list of specific 

 traits, structural and physiological, in a 

 long list of plant and animal species, and a 

 rather impressive list for the human spe- 

 cies, about the inheritance of which quite 

 specific and precise things can be affirmed 

 as a result of the intensive study of 

 heredity that has been done in the last 

 twenty years. 



All of these things are interesting and 

 some are both interesting and useful. 

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