MANURE. 



165 



night-soil, before drying. But, however prepared, poudrette 

 varies much in quality. Analysis alone can determine its 

 true value. Four samples of dried night-soil, examined by 

 Professor Johnston, afforded as follows, per 100 parts : 



Insoluble silicious matter, 37.42 24.46 8.44 45.04 



Very recently, Soubeiran has analyzed the poudrette of 

 Montfaucon, near Paris. Taking into view the state in which 

 ammonia exists in manure, Soubeiran has, with great skill, 

 separated that which exists as putrescible animal matter, or 

 as an easily soluble ammoniacal salt, from that which exists 

 as a less soluble compound of ammonia, magnesia, and phos- 

 phoric acid, a triple salt, which is slowly decomposed in the 

 soil. Fresh and warm poudrette, as sold at Montfaucon, to 

 farmers, in November, 1847, contained in 100 parts, — 



Water, . 

 Organic matter, 

 Soluble alkaline salts. 

 Carbonate of lime 

 Sulphate of lime, 

 Ammoniaco-magnesian phosphate. 



