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

 tliat might not be at all noticed by a common manual laborer. A headache 

 disables the one, a backache the other. 



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

 mind the average individual who is called "neurasthenic" or "hysteric" or 

 as being "imaginary ill" we will have some idea of what is meant. It is 

 sometimes said that "the complaints of the neurasthenic are innumerable," 

 but they are enumerable, and they are preventable in perhaps nine-tenths 

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

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

 enable them to continue life under the old environment.) 



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

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

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

 all have noticed that there 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; tliis again may largely (Icpcud on air condi- 

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



Cardio-vascular Tjpo: 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 apoplexies, 

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

 so that the dust victim will take heed in time. (An Interesting question 

 to the physician is, What preceded an apoplexy? To what extent, for in- 

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

 train or street car, shopping In ill ventilated stores. In short, having been 

 exposed to infected dust?) 



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

 skin, conditions or syniptoms at times difficult to explain. 



Genital Type : Here come particularly women who have pelvic dis- 

 turbances, both acute and chronic, which interferes more or less with the 

 process of reproduction. This type should be considered in the matter of 

 race suicide. "Flat life" is very destructive to human life, all sorts of 

 factors nnist be considered— one rarely considered is the dust factor. 



