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and shut, they require no attention; the 

 stable requires no airing in the morning, 

 because it is always aired ; and when being 

 cleaned and swept, the dust is immediately 

 carried out by the air currents, so as not 

 to be annoying. 



But it should be distinctly understood 

 and remembered, that the inorganic dust 

 is much less harmful than the organic 

 dust — those microscopic germs, before 

 spoken of, which, though they cannot be 

 seen, are potent for evil, ^'the invisible 

 powers of the air," whose acquaintance we 

 have formed only in recent years, which 

 commit their depredations in the quiet, 

 and on the sly, and which revel most where 

 the air is most foul and most stagnant. 



But of much more consequence is the 



