I *6 ] 



diftant from towns, and deftitute of marie, lime- 

 ftone, chalk, and every thing that is known from 

 pra&ice to renovate the fer ility of exhaufted and 

 impoverifhed land. Here then the only refource 

 }k fallowing, and the necelTity of it proceeds, firft, 

 from the principles or particles neceiTary to the 

 growth of vegetables being exhaufted by prece- 

 ding crops ; and fecondly, by the want of manures 

 neceiTary to reftore and replenifh the foil with 

 thofe principles which the preceding crops had 

 deprived it of and carried off, 



Here, indeed, a very interefting and important 

 queftion may mfc : — How, or by what means, can 

 land lying fallow or unoccupied, have thofe par- 

 ticles neceiTary to fertility reftored? That fal- 

 lowing has this beneficial cfFect cannot be denied, 

 becaufe all experience bears indifpu table evidence 

 to the truth of it. The effect is univerfally ad- 

 mitted, but the* caufe is the great defuleratum. 

 It muft be obferved, it is not mere reft that 

 enriches and invigorates an exhaufted foil. Its 

 improvement, in general, will be in proportion 

 to the culture beftowed upon it. This was fully 

 evinced by the ingenious Mr. Tullj who clearly 

 demonftrated by facts the great benefit of pulve- 

 rization But though his practice was right, as 

 it certainty promoted the fertility of his land, the 



principles 



