THE COMPOSITION OF EXPIRED AIR. 



411 



and of preventing the entrance of poisonous gases like carbonic oxide 

 derived from heating and lighting apparatus, rather than upon simply 

 diluting the air to a certain standard of proportion of carbonic acid present. 

 It would be very unwise to conclude, from the facts given in this 

 report, that the standards of air supply for the ventilation of inhabited 

 rooms, which standards are now generally accepted by sanitarians as 

 the result of the work of Pettenkofer, De Chaumont, and others, are 

 much too large under any circumstances, or that the differences in 

 health and vigor between those who spend tlie greater part of their 

 lives in the open air of the country hills, and those who live in the city 

 slums, do not depend in any way upon the differences between the 

 atmospheres of the two localities except as regards the number and 

 character of microorganisms. 



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