THE BARN 131 



animals are very similar to our own and they 

 too must suffer from the bad effects of breath- 

 ing impure air. "Without doubt the alarming 

 prevalence of tuberculosis among dairy cattle 

 is largely due to this cause. Hence this neg- 

 lected feature of barn construction is deemed 

 worthy of detailed mention in this book. 



The King system best for barns. In a well- 

 ventilated barn the air is almost as pure and 

 fresh and free from bad odors as it is in the 

 most sanitary home. The most successful and 

 most widely used method of ventilation in this 

 country is known as the King system. It is so 

 perfect in its operation, so inexpensive, and so 

 easy to install that no up-to-date dairy barn 

 should be built without this or a similar system 

 of ventilation. 



The ventilating flues — how installed. In this 

 system air is taken in on the outside of the barn 

 near the ground, passes up through an air space 

 in the walls made in the form of a wooden box, 

 and is admitted into the barn near the ceiling. 

 This method of admitting the air prevents 

 draughts and forces the bad air to the floor, 

 where it is drawn out through ventilating flues 

 that extend from one foot of the floor to above 

 the roof of the barn. It is important that these 

 flues reach nearly to the floor, otherwise the 

 warm air of the barn, which is found near the 



