1 12 MANURE. 



Geine, 17.43, 14.45 in common dung. 



Salts, .93, .95 " " 



Water, 81.64, 83.60 " ** 



Probably the nitrogen was 2^ per cent., or five times that 

 of common cow-dung. 



200. Doubtless the value of all excrements will depend 

 somewhat upon the food of the animal, and the manner of 

 feeding. It may be stated as a general fact, that the manure 

 of cattle, summer-soiled, is nearly twice the strength of 

 that from the stalls in winter; and all fattening cattle, 

 whether in winter or summer, produce, as has been stated, 

 a still richer vegetable food. Animals fattening on oil cake, 

 gave manure, 12 loads of which exceeded in value of crops 

 raised, 24 of common stock. These remarks show, that 

 some allowance is to be made for the food. The standard 

 refers only to hay and potatoes. But the value due to dif- 

 ferent food, may not be so great as is commonly supposed. 

 The actual amount of nitrogen, even where vegetable and 

 animal food is concerned, is not materially different. There 

 were two dogs, which were fed, the one on vegetable, the 

 other on animal food ; at the appointed time, these animals 

 were sacrificed on the altar of physiological experiment, and 

 the chyle examined. The following were the results : 



These are the sources of ammonia, if the chyle had been 

 allowed to putrefy. 



201. The ammonia in dung, as has been explained, is the 

 source both of the rapid conversion of the hay into soluble 



