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none at present which, in itself, combines all 

 these qualities ; barn yard manure, enclosing 

 nearly all the matters necessary to vegetation, 

 is the nearest to the standard, but still is not 

 always sufficient. Its proportion of phos- 

 phates is limited, and moreover the supply of 

 this manure is not equal to the demand. 



An intelligent manufacturer, Chaviteau, has 

 responded to this want of the farmer, and, fol- 

 lowing out the principles of Boussingault? 

 Pay en, Liebig and Gasparin, has founded, at 

 Paris, an establishment for the manufacture of 

 manures compounded with regard to the soil 

 and the nature of the crops. His manures 

 contain not only sufficient proportions of am- 

 moniacal salts and nitrogenous matters, but 

 also the alkaline salts and earthy phosphates, 

 sulphates and chlorides ; in a word, all the 

 matters beneficial to the diffei^nt crops. 

 There were others, previous to Chaviteau, 

 who prepared the compound manures with 

 more or less success; but unfortunately these 

 preparations, known by different names, rare- 

 ly have an intrinsic value equal with their 

 price. Moreover, through ignorance or un- 

 skilful manipulation, their composition is sel- 

 dom or never uniform. 



