180 BOAKD OF AGRICULTURE. [Pub. Doc. 



Then, the system of ventilation is this. The barn is in 

 the form of an L, 142 feet long. At the intersection of the 

 L stands a shaft, 3 feet square, that rises clear above the 

 ridge line, with galvanized iron so as to make it air tight. 

 Now, that is depended on to draw off the foul air, and in this, 

 even with the floor of the stable, on this side of the shaft 

 [showing] is a 21 inch register, and on this side [showing] 

 the same waj% leading into the shaft, so that here is a current 

 of foul air thrown off by the cows' breathing, being about 15 

 per cent heavier than common air. The stable floor is com- 

 posed of plank. I don't use cement. This mammary gland 

 is a peculiar and wonderful gland, and I don't want any 

 danger to it from that source. I have never had a case of 

 garget in nvy herd, and I think it is due to the fact that I 

 guard against it specially by conditions. 



Now, then, that is the process by which the foul air is 

 drawn out. How shall the pure air come in, and not lose 

 the heat? Wc shall call that [showing] the wall of the 

 stable, and this down here [showing] the outside. Down here 

 [showing] is a 12 by 12 .iron register, open all the time. 

 Now, the air rises up between the studding, this outside 

 partition, you know, this outside space of 4 inches there 

 between the studding, it rises up and the paper is broken 

 through the top even with the ceiling, and it comes in here 

 [showing] in another 12 inch register that } r ou can shut or 

 open, as you are a mind to. Those are running clear around 

 the stable, even with the ceiling. Now, the pure air rises 

 up and comes through this strata of warm air. The warm 

 air is always up against the ceiling. All the hay chutes 

 and silo chutes are kept shut, so there is no drawing off 

 of the air in the barn above, and this warm air rises up 

 and comes through, and, being lighter, cannot flow out 

 through that same register. The warm air comes up in 

 here [showing] and then down, and the cold air rises and 

 goes through, and the warm air is retained. So all around 

 this barn, with about .50 or 60 animals, }-oung and old, 

 are these different registers, and the air pouring into the 

 barn and pouring out at this central shaft. That works all 

 the time automatically, and the air in that barn is clear and 



