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rifing or falling of the furface, which he may do with a plough of another form. If the wheels are fuddenly raifed by ftones, a rife of the furface, or even by clods, or the tilled ground, that inftant the plough muft be thrown out of the earth, by the beam be- ing lifted up along with the wheels on which it refts; fo that the depth of the furrow muft be raifed, and the foil improperly ftirred: And this inconvenience muft remain while the interruption continues, and be repeat- ed as often as a like interruption oc- curs. Befides all this, in fuch finely culti- vated flat foil, wherein only this plough can be ufed with advantage, it is no diffi- cult matter for a very ordinary ploughman, with a common plough, to form a furrow, {o well fhaped in every refpect, that it will require a confiderable degree of attention to diftinguifh itfrom one made with the wheel- plough, and will make no defcernible diffe- rence on the crop.

On the other hand, the difadvantages of this plough are abundantly manifeft.— It 1s, in the firft place, very complex, which, all

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