Urine 



pigs, which contains nearly 97 per cent, of water, is 

 scarcely worth the cost of transport, while that of 

 horses, containing not more than 90 per cent, of 

 water, is much richer. Here are some averages : — 



Animal. Water. Nitrogen. Pbos. Acid. Potash. 



Sheep .. .. .. 88-5 1-30 o'Oi i"8o 



Horses .. .. .. 90-0 1-50 a trace i"oo 



Cattle .. .. .. 9i'0 i"oo ,, 1*35 



Pigs .. .. .. 97'o 0-50 0-15 0-70 



The quantity is, of course, largely dependent on 

 the nature of the food ; thus, cows fed on mangolds 

 give twice as much as those fed on hay. Horses 

 fed on young clover give much more than those 

 kept on a dry regime. The urine of pigs and cattle 

 is comparatively abundant, whUst that of horses 

 is much less so, and that of sheep quite insignificant. 



In young animals, also in milch cows which use 

 a part of their food for the replacing of living 

 tissue or for the production of milk, it is not rich, 

 whilst that of grazing beasts, only making fat, which 

 does not contain fertilising elements, is very 

 rich. 



Draught horses and oxen also produce a rich 

 urine, because they do not transform anything into 

 increase of organic matter, and their work only 

 calls for hydrocarbons. A food that is richer in 

 nitrogen and more digestible will give a better urine, 

 because the albuminoids appear in it almost com- 

 plete. To get a liquid manure that will be useful 

 for every purpose it is necessary to blend the various 

 urines. 



Nitrogen is found in urine chiefly in the form of 



103 



