208 BOARD OF AGRICULTURE, [Jan., 



ing, all the cracks and crevices are filled by in-rusliing cold 

 air. We simply take advantage of that, and introduce that 

 air by apertures at the bottom. Those can be made directly 

 through, but that creates a draft ; it comes in in a too solid 

 body. I would suggest a box, two or three feet wide and 

 deep at the ends, running the lengtli of your stable, with 

 numerous perforations, wliich allow the air to be divided, as I 

 said, the same as tlie current of water going through a hose 

 pipe is divided by the hose nozzle that is oftentimes put on 

 the end. Sometimes tlie air is introduced by an aperture at 

 the top through the building, with a funnel coming down to 

 the bottom ; the idea being to warm that column of air a lit- 

 tle before it is introduced into the building by the warm air in 

 the room. In that case, the opening should be at the bottom. 



Col. Warner. I should like to ask the doctor another 

 question in connection with that. He says the carbonic acid 

 gas rises. He has previously told us it was heavier than the 

 atmosphere. How, then, can it rise? 



Dr. BowEN. Because it is warmed by passing through the 

 lungs of the animals. 



Col. Warner. Yes, but after it is thrown out from the 

 lungs it becomes immediately of the same temperature as 

 the air with which it intermingles. 



Dr. BowEN. It rises first, before it has a chance to inter- 

 mingle. 



Col. Warner. The cattle are lying down ; they breathe 

 right down by the floor. The carbonic acid gas immediately, 

 or within a short time, becomes of the same temperature as 

 the surrounding atmosphere. I think most of our scientific 

 men now say we should ventilate our houses from the floor. 

 Heretofore it has been done from the ceiling, because, as the 

 doctor explains, the air being lighter and warmer up there, it 

 will of course escape, and there will always be a current 

 there, no matter whetlier there is any impure air in the room 

 or not. One of the most celebrated heating companies in 

 America to-day recommend putting our apertures for getting 

 rid of the vitiated air in the mould-board, so to speak, around 



