CHAPTER III. 



AIR AND VENTILATION. 



Pure air is essential for the maintenance 

 of health, and in order that animals may 

 receive a pure supply of this, it is necessary 

 that proper attention be paid to the ventila- 

 tion of a stable. 



The atmosphere in a stable soon becomes 

 impure when the doors, windows, etc., are 

 closed, partly through the carbon and oxide 

 gas given off from the lungs, and partly 

 through gases arising through the decay 

 of animal and vegetable waste materials. 



Pure air is composed of two colourless 

 gases, oxygen and nitrogen, mixed to- 



