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productive stage ; when removal to the crowded city takes place elimina- 

 tion through disease is apt to go on actively. 



Reaction to environment varies greatly, from a feeling of health to 

 illhealth and disease. Pain is to be regarded as a warning from nature 

 and plays an important role in the process of adaptation to environment. 

 Some strains or individuals are wholly uuadapted to city life with its 

 manifold disease-producing conditions. Many disease-producing conditions 

 have been eliminated from city life today, others are more active than ever, 

 notably the impure air factor. 



A study of simple country conditions, of village conditions, of town 

 and small city conditions may shed much light on the complex city life. 

 Much of the illhealth and disease of the large city is preventable and the 

 lives of many can be lengthened. The erection of more hospitals, as ordi- 

 narily conducted, is not a remedy for correcting the evils of city environ- 

 ment; the environmental influences are themselves to be largely altered. 

 Much depends on education and there is urgent need for an institution 

 that will take up the study of factors operative today. 



