Food for 

 Plant* 



Composition of the mixed excrement : 



Nitrogen 



Phosphoric acid 

 Potash 



.51 per cent. 



35 " 

 .51 " 



Value per ton $2.46 



A few days later a second trial was made with four of 

 the same cows and the solid and liquid excrement carefully 

 collected and analyzed separately. The conditions of food, 

 water, etc., were almost identical. 



Average weight, 

 Average food eaten, 

 Average water drunk, 



The four animals yielded in twenty-four hours 255 

 pounds of solid and 72.25 pounds of liquid excrement, which 

 had the following composition: 



Solid, 

 Per Cent. 



Nitrogen 26 



Phosphoric acid 28 



Potash 20 



Value per ton $2.08 



Liquid, 

 Per Cent 

 1.32 



Mixed, 

 Per Cent. 

 49 



.22 

 .38 



The average of the two trials shows that well-fed cows, 

 yielding milk heavily, may be counted upon to return nearly 

 ten cents' worth of valuable fertilizing materials per day, and 



