WHAT MEDICINE HAS DONE AND IS DOING FOR THE RACE 457 



made to the rapid effect of skilled medical advice in con- 

 nection with the occurrence of jaundice and hepatic disease 

 in aeroplane workers who used tetrachlorethane ("dope") to 

 paint the wings of aeroplanes in England at an early stage of 

 the Great War, and later on in the War in the care of workers 

 in munition factories where trinitrotoluene ("t.n.t.") was used. 

 It may be pointed out that the exigencies of the War stimu- 

 lated efforts in the direction of industrial hygiene. The practical 

 apphcation of experimental psychology, which investigates 

 the responses of individuals to definite prescribed condi- 

 tions, has proved to be of great economic value in increasing 

 the output of work in factories and workshops by modifying 

 the conditions of work, particularly by the introduction of 

 intervals of rest, maintaining good atmospheric conditions 

 so as to obviate fatigue, and by minimizing monotony and 

 boredom. 



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