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antitoxins which prevent the entrance of more serious 

 infections. 



Frequently the most difficult task of the physician is to 

 tell what is the matter with his patient. The human body 

 is such a complicated mechanism that symptoms may 

 come by very circuitous routes and be difficult of diagnosis. 

 Doctors are often blamed for not giving proper treatment 

 when they have been obliged to choose from two or three 

 possibilities. It is unfortunate that ability to diagnose 

 correctly is usually difficult to acquire and comes only with 

 wide knowledge and long experience, while the mere 

 treatment of most diseases is comparatively easy. 



Race Preservation. Herter* says: "the sex instinct is 

 the only human instinct that can be compared with the 

 instinct of self-preservation in respect to the profundity 

 of its influence on the conduct of man." The activities 

 associated with mating, loving, and the rearing of offspring 

 dominate the life of every normal adult individual. Though 

 sex-determination perhaps depends only upon the presence 

 or absence of an accessory chromosome in the sperm cell 

 which fertilizes the egg and thus initiates a new human 

 being, the two sexes show fundamental differences in their 

 instincts. 



A man is larger and stronger than a woman. His 

 secondary sex characters (beard, deep voice, great strength, 

 and more aggressive disposition) fit him to hunt, fight, or 

 endure other privations necessary for the maintenance 

 of a family. Woman, with her soft voice, mammary glands, 

 and disposition to foster and cherish, is anchored to the 

 central interest of family, forcing her to a relatively sessile 

 life. The structural differences between the sexes are 

 associated with characteristic tastes and habits. "The 

 essential differences between the mental life of woman 

 and that of man apparently depends upon the fact that the 

 cerebral organization represents and reflects the various 

 aspects of the sexual functions, which irradiate as it were, 



* "Biological Aspects of Human Problems," N. Y., 1911. 



