ZOOLOGICAL SCIENCE 219 



tion, more fundamental knowledge will be demanded and 

 medical science must draw upon every part of the animal 

 kingdom. The lower invertebrates and the protozoa are 

 already familiar objects in medical laboratories. 



As zoology becomes more exact in its conclusions, it will 

 have greater value in the social sciences. At present the 

 influence of biological science within these fields consists 

 largely in the point of view which it imparts. But the 

 significance of zoological and particularly medical knowledge 

 is becoming evident to the social worker. He is eager for the 

 latest facts on heredity, hygiene, and sanitation; and this 

 eagerness will be lasting. The fact that the human species 

 is a product of evolution is acknowledged by students of 

 society. But we need a wider understanding of the zoologi- 

 cal basis of human behavior than now exists. Once estab- 

 lished, such an understanding must exercise a profound 

 effect upon the social activities of the human race. Now 

 that zoology is progressing toward the^experimental analysis, 

 and hence the control, of vital phenomena, its conclusions 

 will be held in more esteem, because they will rest in- 

 creasingly upon experimentation. In the future, the zo- 

 ologist will be heard upon a subject like heredity, not for his 

 much speaking, but because he presents facts that cannot 

 be denied and that are obviously important for the welfare 

 of mankind. 



