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heavy fhower of rain comes. I do not alk 

 what the culture has been, the quantity of 

 feed, nor any other particular; I venture 

 to pronounce that part of the field to yield 

 the worfl: crop ; and herein 1 fpeak from 

 particular experience. Such an accident in 

 a large experiment, would utterly deftroy 

 all that fimilitude upon which its whole 

 authority depends. A fmall piece of half 

 an acre, which is ploughed, fown, and 

 harrowed, in an hour's time, cannot be 

 liable to fuch inequalities. Further ; 



The variation of foil in the fame field is 

 prodigious. I have had particular expe- 

 rience of above 700 acres ; — of clays good 

 and bad ; loams heavy and light ; gravels 

 dry and wet ; and I declare, I know not, 

 in that extent, one fmgle field of ten acres, 

 which divided, would form a fair compa- 

 rifon between two methods of culture. 

 During feveral years, I tried many thou- 

 fands of experiments, with an eager defire 

 to difcover the truth, and I rejeded, fronj 

 abfolutc conviction, all comparative expe- 

 riments at largCy as leading to nothing but 

 error. 



An exa(5l fimilitude, fuch as is requifite 



for the condu(ft of comparative experi- 



I i 2 ments. 



