Air and Ventilation 45 



gether in the proportion of 2 1 parts of the 

 former to 79 parts of the latter, together 

 with traces of carbon dioxide, ammonia, 

 watery vapour, ozone, etc. 



The moisture varies with the tempera- 

 ture. 



The oxygen gas is for the purpose of 

 respiration, and the nitrogen to dilute or 

 weaken its stimulating properties. Im- 

 mediately after a horse comes into the 

 stable from work the amount of carbon 

 dioxide o-iven off from the lunt^s is much 

 greater than when it is standing at rest, 

 hence the special need for seeing that the 

 windows, etc., are properly adjusted at this 

 time. 



Many stables have little or no ventilating 

 appliances, It having been thought, ap- 

 parently, that animals could live well 

 enough In any sort of atmosphere. Even 

 '■ in the present day one is often struck with 



