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Article III. 

 Anfwer to Qucjliom refpefting Vegetation. 



Sir, Mancheftcr, June 21, 1782. 



I Shall cfteem myfelf happy if any thing I have 

 to fubmit to your confideration, in anfwer to 

 your queftiohs refpecling vegetation, can afford 

 you any fatisfaction on that interefting fubjecl:. 



i/?. Supposing the opinion to be true, which 

 almoft univerfally prevails, that arable land, after 

 having borne a few crops, muft remain fome time 

 fallow before it is fit to produce the fame courfe 

 of crops again: Whence proceeds the neceflity of 

 fuch fallowing; 



> 



Idly. Does the earth by the growth of vegetables 

 lofe any particles neceflary for future vegetation? 



I (late thefe two queftions together, becaufe the 

 confideration of the fecond feems properly to be 

 previous to the rirft. 



That the earth, by the growth of vegetables, is 

 exhaufted of thofe principles which are necelfary 

 to future vegetation, is abundantly manifeft from 



the 



