108 



EXCRETA OF ANIMALS 



The following table gives analyses of the excrements of the com- 

 mon farm animals and of man. The figures are quoted by Storer l 

 from analyses by Stoeckhardt and Way : 



PERCENTAGE COMPOSITION OF ANIMAL EXCREMENTS. 



From the preceding tables, it will be seen that the excrements of 

 the sheep are less watery than those of the other animals, while the 

 solid excrement of the cow and the urine of pigs are richest in water. 



Other analyses of the excrements of horses and cows have been 

 published by Boussingault and by Audoynaud and Zachare\vicz.~ 

 The results, expressed in percentages, were as follows : 



In the paper referred to, the authors estimate the annual yield per 

 cow at 31*5 kilograms of nitrogen and 4O8 kilograms of potash in the 

 urine and 42 kilograms of nitrogen, 4*2 of potash, and 12 of phos- 

 phorus pentoxide in the dung ; while in the total excreta of one 

 horse per annum will be 37'8 kilograms of nitrogen, 13'1 of potash, 

 and 14*4 of phosphorus pentoxide. They think that the potash in 

 dung is that existing in the food as inorganic salts, while that in the 



1 Agriculture in some of its Relations to Chemistry, Vol. I, p. 489. 

 2 vide Abstract in Jour. Soc. Chem. Ind., 1886, 541. 



