FOODS FOR USE IN THE DAIRY. 143 



The quantity of the above-named fluids secreted every 

 twenty-four hours is very large; in a man of 140 pounds' 

 weight the amount is as follows : 



Pounds. 



Saliva--.: 2.88 



Gastric fluid-.. --14.00 



Bile-- 3.43 



Total - 35.03 



Ibnnds. 



Pancreatic fluid 1.87 



Lymph 3.86 



The quantity secreted by a cow is even larger in pro- 

 portion to its greater weight. 



These figures indicate and even prove that salt is a 

 most indispensable article of food. The quantity se- 

 creted by a horse or an ox, in which animals these fluids 

 are produced more copiously than in any others, has not 

 been determined, for obvious reasons, but it must be 

 several times larger than the human secretions. All 

 this goes to show the absolute and indispensable neces- 

 sity for an adequate supply of salt as food — not as a con- 

 diment or a relish to the food, but as necessary aliment, 

 without which animals cannot perform their functions 

 of digestion and nutrition, and make a healthful and 

 satisfactory growth. 



But it is also proper to make some computation of the 

 discharge of this substance from the system in the waste 

 matter excreted. The animal system is in constant 

 course of destruction and renewal. A man of one hun- 

 dred and forty pounds' weight discharges in all the 

 excreted matter seven and one-quarter pounds every 

 twenty-four hours, that is, the whole body requires com- 

 plete renewal every twenty days, and an absorption of 

 seven and one-quarter pounds daily of various matters. 

 An ox or a horse performing the same vital functions re- 

 quires a proportionate supply to make up its proportion- 

 ate waste. So that as a large quantity of salt is thrown 

 off in this waste every day, an equal amount must be 

 supplied to restore the loss, It has been calculated that 



