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experiment, of going below the commoii 

 depth, may fometimes anfwer. But where 

 the top and bottom, for eighteen or 

 twenty indies depth, confiils of the fame 

 foil, I do not believe it is ever worth 

 while, to exchange the upper part, which 

 Jias been enriched for centuries back, for 

 a part lefs rich, merely becaufe it is more 

 frefh. I have indeed obferved, that deep 

 ploughing (except for fome particular 

 grain and plants) is by no means necef- 

 lary. The vegetation of ordinary corn, 

 and grafs, does not require any great 

 depth. In many parts of Comwa//, the 

 land is exceedingly fruitful, though the 

 foil is extremely fhallow ; and, in many 

 other counties, they find, by experience, 

 that they ruin their land by ploughing 

 below the ufual depth. Befides, when 

 land is ploughed very deep, the roots of 

 the weeds are only turned over, and re- 

 moved. 



