CHAPTER XI. 



SOME OBJECTIONS, PROTESTS, AND QUERIES 

 ANSWERED. 



MANY usually very reasonable persons, 

 when brought face to face with such 

 disagreeable facts as have been here set forth, 

 are disposed to petulantly exclaim that they 

 and their friends have got along very well thus 

 far with the dust which they have encountered, 

 and that they don't want to be worried with 

 the possibilities of danger which may lurk un- 

 seen about them. The world's people, they 

 say, have managed to live along in large num- 

 bers for a good many centuries without know- 

 ing any thing about the bacteria which may be 

 sporting in this excellent canopy, the air. 



To these rather short-sighted and impatient 

 expostulations it may be answered : The fact 

 still remains that about one out of seven of 

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