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life an individual leads. The brain worker may be disabled by symptoms 

 that niiijht not be at all noticed by a conimon manual laborer. A headache 

 disables the one, a backache the other. 



The nervous type is difhcult to define briefly, but if we will keep in 

 mind the avci'a.iic individual who is called "neurasthenic" or "hysteric" or 

 as being "imagin.ary ill"' we will have some idea of what is meant. It is 

 sometimes said that "the com])laints of the neurasthenic are innumerable," 

 but they are enumerable, an<l they are preventable in i)erhaps nine-tenths 

 of the cases that ordinarily come before the physician. (All some people 

 need is good air — but what patients usually want is medicine that will 

 enable them to continue life under the old environment.) 



Psychic Type: Some individuals react mentally, especially to the air 

 of crowds. Dull school children are often dust victims. Men are subject 

 to moods and humors ; they may be agreeable or disagreeable. Perhaps 

 all have noticed that thei'e are times when one can think clearly and 

 persistently and there are times when thoughts will not come or when 

 one can not reason clearly ; this again may largely depend on air condi- 

 tions. The reaction may even be so extreme that we speak of insanity. 



Cardio-vascular Type : Here there is more or less marked change in 

 heart action and blood pressure, especially an elevation or hypertension, 

 this may manifest itself mentally, overlapping the above type. 



Dust victims may be divided into two groups according to the blood 

 pressure, whether low or high. The one tends to end in wasting diseases 

 like tuberculosis and catarrhal pneumonia and the other by a])0])lexies, 

 paralyses and Bright's disease. It is necessary to mention these things 

 so that the dust victim will take heed in time. (.Vn interesting question 

 to the physician is. What preceded an ai)oiilexy? To what extent, for in- 

 stance, was something done out of the usual, as riding on an overcrowded 

 train or street car, shopjiing in ill ventilated stores, in short, having been 

 expo.sed to infected dust?) 



Cutaneous type is manifested especially in so-called neuroses of the 

 skin, conditions or symptoms at times diflicnlt to explain. 



Genital Tyi)e: Here come iiart icularty wdnicn who have jx'lvic dis- 

 turbances, both acute ,111(1 chfoiiic. which interferes more or less with the 

 process of rejirodud ion. Tliis t.\ii;' siiould be considered in the matter of 

 race suicide. "Mat life" is wry destructive to Ininian life, all sorts of 

 factors must be considei'nl — one rarcMy considered is tlu^ dust factor. 



