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remarked in the common harrows, and partly from 

 the tines being fixed ftraight downward; but thefe 

 being bent, and pointing forward, and alfo fixed at 

 1 8 inches diftance, draw into the earth as deep as 

 the ploughing, rending the ground in an extraor- 

 dinary manner, and leave the hard clods to pafs 

 freely through ; yet no ground remains untouched 

 more than three inches from the point of one tine 

 to the point of another. The hinder poft or rail is 

 twice as heavy as either of the others, to keep down 

 that part as deep as is necefiary, which otherwife 

 would not be the cafe. My land is in general to- 

 lerably free, fo that four large, or fix common oxen 

 draw it well ; but I prefer four of our little horfes 

 to either. 



I do not expect, that either the harrow or drag 

 are fo perfect as to admit of no improvement ; but 

 if they are inducements, only for fome abler perfbns 

 to exercife their genius for the benefit of the public, 

 I (hall be amply rewarded for the thought, trouble, 

 and expence, I have been at. 



I am, with much refpect, &c. 



R. TREFFRY. 



Beer-Barton, near Plymouth, 

 July 1787. 



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