56 VETERINAEY HYGIENE 



From this can be calculated the amount of fresh air 

 required by the large herbivora per hour, by using de 



Chaumont's equation -=cl 



where e = the amount of carbonic acid in cubic feet 

 exhaled per hour, viz., 3. 

 p = the limit of permissible organic impurity 



per cubic foot, viz., '0002. 

 d = the amount of fresh air required in cubic 

 feet per hour. 



-A_ = 15,000 cubic feet per hour. 

 '000^ 



That is to say, the large herbivora require 15,000 cubic 

 feet of fresh air per hour, in order that the organic impurity 

 may not exceed "2 per 1,000 of carbonic acid. 



During work the amount of carbonic acid is greatly 

 increased. It is only in mines that animals work in an 

 enclosed space, and here the supply of fresh air per head 

 should not fall below the above quantity, it is hardly 

 practicable to ask for more, and being small ponies this 

 .amount must suffice. 



The quantity of air required by the sick should be 

 unlimited, if possible they should live almost in the 

 open. 



In calculating the amount of fresh air required the 

 combustion of artificial Hghts must not be forgotten. 

 .Every cubic foot of coal gas produces '5 cubic feet of 

 carbonic acid, and requires 500 cubic feet of air to properly 

 dilute the products of combustion. 



In badly ventilated stables the amount of watery vapour 

 is increased. A horse gives off from the lungs and skin in 

 a state of repose 6'4 lbs. water in 24 hours,* and where the 

 amount of fresh air introduced is insufficient to remove tht 

 excessive moisture, great discomfort and oppression exist, 

 We have previously drawn attention to this fact, and repeal 



* This is according to the careful experiments of Grandeau ; Colii 

 places the figure much higher. 



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