352 Eural Architecture. 



So poisonous is the organic principle removed from 

 the lungs that Brown-Sequard in 1887 condensed the 

 vapor of expired air and injected 15 cc. of it into a rabbit 

 which died from the effects. Brown-Sequard considered 

 the substance a volatile alkaloid secreted by the lungs. 



Water standing over night in a poorly ventilated, room 

 or stable conies to have a very disagreeable taste from the 

 absorption of impurities from the air and this is one of the 

 most serious objections to keeping water standing in the 

 stable for cows or other animals. 



435. Micro-organisms and Dust in the Air. It has long 



been recognized that the air of old and poorly ventilated 

 houses, especially if they are not kept clean, contains 

 many more dust particles, spores and micro-organisms 

 than newer and better ventilated houses do. The same 

 must be true also of stables but in a higher degrea The 

 amount of dust and of organisms as well is almost always 

 more abundant in occupied rooms than in the open air. 

 This would be expected both because of the slowing down 

 of air movements after entering the house, which acts 

 exactly like a silt basin in a line of tile, and because of 

 their production there from various causes. 



Strong ventilation tends to remove these organisms and 

 dust particles with the air from the compartments and 

 this is the rational basis for airing a bedroom or any other 

 after sweeping. The air has been filled with both sets of 

 impurities and opening the windows or using any other 

 means of producing a strong current will help to clear the 

 room. 



436. Bad Ventilation Predisposes to Disease. The most 

 helpful health rule which man can adopt for himself or 

 for his domestic animals is to avoid whatever tends to 

 weaken the system and to take advantage of whatever 

 tends to greater vigor. 



