( 482 ) 



and broad-caft hufbandry in the culture of 

 wheat : for this purpofe the foil muft be 

 contiguous, and in every refped: of the 

 fame nature as to ftifFnefs, lightnefs, lying 

 dry or wet, barrennefs, or fertility. The 

 expofure muft be the fame ; all parts of 

 the field equally flieltered by hedges, trees, 

 hills, &c. &c. In a word, every circumftance 

 perfed:ly fimilar : the feed muft be of the 

 fame heap ; the times of all the ploughing^, 

 harrowings, fowing, culture, &cc. &c. &c. 

 precifely the fame to an hour. 



Now, let the reader mark the progrefs 

 of fuch an experiment, when carried on 

 in large, Suppofe a field of ten acres is 

 dedicated to this ufe, ten ploughs are at 

 once neceflary, in every operation, from 

 the beginning to the end ; for if the w^hole 

 be not ploughed always on the fame day, 

 the accuracy is at once broke in a material 

 point. Thus, a man for executing fuch a 

 trial muft, at the very loweft, keep twenty 

 horfes. This is no wanton objedion, but 

 mere fad. In fpring fowings, the import- 

 ance of it is more ftriking. Suppofe the 

 foil a heavy moift loam, (not a mouldering 

 rich clay) and fowing with barley. Juft 

 after fowing one part of tire field, a very 



heavy 



