CHAPTER IX. 



DUST-DANGERS OUT-OF-DOORS AND IN PRIVATE 



HOUSES, WITH SUGGESTIONS FOR 



THEIR AVOIDANCE. 



WITH all these facts about the most 

 common way in which consumption is 

 transmitted from one to another before us, we 

 are ready to consider what the places are in 

 which healthy persons are most likely to be 

 forced to breathe air which contains this or 

 other infected dust, and what should be done 

 to avoid it. 



It should always be held in mind, in con- 

 sideririg the facts and suggestions which this 

 chapter contains, that the safeguards of the 

 body against inhaled germs, which we have 

 already looked at in another chapter, are 

 constantly in action, and in large degree, in 

 many persons, actually and wholly protect 



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