332 



MAOTRES. 



established theories concerning the use of manure, the atten- 

 tion of the reader is called to the following : 



Classification and description of manures. 



Manures naturally divide themselves into such as are of 

 mineral, of vegetable, and of animal origin. 



Mineral manures are such as originate from various 

 mineral substances, such as lime, which is the product of 

 limestone, marble, chalk, or marl, after the carbonic acid 

 has been expelled by an intense heat ; marls, which are 

 composed of carbonate of lime, mixed with clay, sand, or 

 loam; shell sand, calcareous sand, green sand marl, gyp- 

 sum, phosphate of lime, salt, and salts of various kinds, 

 &c. 



Vegetable manures are such as are produced from de- 

 composed vegetable matters, which also contain some of the 

 inorganic or mineral substances. 



Animal manures consist chiefly of the flesh, blood, bones, 

 horns, and hair of sea and land animals, and of the solid and 

 liquid excrements of land animals and birds, and also con- 

 tain some of the inorganic or mineral matters. 



Analysis of Fish Guano. 



Water expelled by 212 heat. . 8.06 



Sand 0.33 



Oil 2.40 



Organic Matter 50.72 



Super-Phosphate of Lime 9.85 



Sulphate of Lime, Hydrated. . . 19.62 



Sulphate of Magnesia 0.71 



" Potash 2.05 



Soda 2.42 



Chloride of Sodium 1.12 



Sulphate of Ammonia. 2.72 



Dr. Apjohn. 



