CHAPTER XII. 



SUMMARY AND CONCLUSION. 



IF, now, we sum up the main points which 

 have been urged regarding the ordinary 

 mode of transmission from one to another 

 through the air of the germ of consumption 

 and the means of avoiding it, we see, in the 

 first place, that the most complete remedy of 

 existing evils is simply the immediate destruc- 

 tion of the material discharged from the lungs 

 of affected persons ; second, the practice, both 

 in private houses, in places of assembly, and 

 in public conveyances, of more intelligent and 

 efficient systems of cleaning, and particularly 

 the adoption of appropriate means for getting 

 rid of the floating or settled dust. 



The dust of ordinarily clean public rooms 

 and of private houses is not, as we have seen, 

 dangerous or especially harmful unless it has 



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