MANURE. 139 



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 different food, may not be 

 so great as is commonly supposed. The actual 

 amount of nitrogen, even where vegetable and ani- 

 mal food is concerned, is not materially different. 

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

 vegetable food alone, the other on animal ; at the 

 appointed time, these animals were sacrificed on the 

 altar of physiological experiment, and the chyle ex- 

 amined ; the following were the results : 



Water, 9306 89-02. 



Fibrin, -06 -08. 



Albumen, 4.6 4*7. 



Salts, -8 -7. 



These are the sources of ammonia, if the chyle 

 had been allowed to putrefy. 



201. The ammonia in dung, as has been ex- 

 plained, is the source both of the rapid conversion of 

 the hay into soluble geine, and of nitrates. The ac- 

 tion of unfermented dung needs no explanation after 

 this exposition. The geine, the salts, carbonic acid, 



