( 33 ) 



Of all the manures or mixtures compounded 

 for the amelioration of the soil, the most 

 known is that of Jauffret. It consists of 

 shrubbery, stalks, &c., soaked with a ley of 

 dilute animal manures and saline substances. 

 These latter add to the manure the elements 

 which are wanting in the shrubbery, &c. 



The recipe is empirical, but notwithstand- 

 ing its imperfections, it has rendered essential 

 benefits to Provence, a poor country defi- 

 cient in grasses, but growing upon its ex- 

 hausted surface a vast extent of wild plants. 



After these theoretic considerations, we 

 proceed to examine the principal substances 

 used as manures, as to their composition, value 

 and preparation. Firstly, we will treat of 

 the nitrogenous manures ; then follow with 

 those of mineral nature and conclude with the 

 ammoniacal salts. 



CHAPTER IV. 



NITROGENOUS MANURES. 



Barn yard Manure. We treat of this 

 first, as the chief means of the farmer for 

 maintaining the fertility of his soil. It con- 

 sists generally of an excipient called litter, 



