Setf. II. Agriculture and Vegetation. \ 5 5 



Cor. 5. As the procefs for preparing ve- 

 getable food is the fame with that for 

 making nitre, farmers mould imitate the 

 manufacturers of nitre, and the nearer they 

 approach to the methods found moil: con- 

 venient to increafe the proflucT: of nitre, the 

 more will they multiply the vegetable ali- 

 ment. In France all old walls and houfes 

 belong to the King, and are made ufe of 

 for the extraction of faltpetre. The King 

 of Pritjjia> by a regulation of confummate 

 policy, has eafed his fubjedts of this bur- 

 then, fhortened the procefs, and increafed 

 the quantity of faltpetre. He has ordered 

 walls of certain dimenfions to be built 

 near every village ; they are compofed of 

 the earth of granaries, ftables, or cellars, 

 mixed with other fat earth. They are 

 built to ftand fome years, till they are fuf- 

 ficiently impregnated with faltpetre. It is 

 obferved by Dr. Pietfch in his Penfesfur k 

 generation de nitre, that the people employ- 

 ed in thefe works, are yet very ignorant, 



that 



