690 



balanced in the case of a large quantity of water being drunk, by 

 the large quantity of urine voided. As the quantity of urine passed 

 by the dilferent animals differs greatly, naturally its composition 

 will also. A horse passes about 12 Ibs. a day, a cow about 70 H>s. 

 per day. Trine is richer in nitrogen and potash than the solid 

 excreta, but poorer in phosphoric acid, in fact it contains very little 

 phosphoric acid. The liquid excreta has a higher manural value 

 than the solid. 



Stoeckhardt tound the following percentages of water, nitrogen, 

 phosphoric acid, and alkalies in the urine of different animals. 



The above table shows that phosphoric acid is only in small 

 quantities in the urine of farm animals, in fact we might say that it 

 is absent, except in the case of pigs. 



Taking the dried urine we get the following results : 



The urine of t ;e pig is richest in nitrogen and phosphoric 

 acid, and poorest in alkalies. The horse comes next in nitn>g< 

 and the cow lowest, but it is highest in potash. 



If we compare Wolff's investigation of urine in the same w; 

 as for the solid excreta, we get the following results. From 100 

 parts of the organic matter, nitrogen and mineral matter dried and 

 free from water, the percentages passed in the liquid excreta 

 are : 



