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1

INERODICIIO N wy

che rudeſt form in which it appears in

this country. Several circumſtances in the conſtruction, even of our oldeſt ploughs, are far from being obvious, and yct the negle& of them would have rendered the ploughs much leſs fit for their work than they are, The circum- ſtances, upon which the goodneſs of a plough depends, are both many, and difficult to be diſcavered; and it re- quires bath great ingenuity and great experience to determine that form of a plough which will enable it to perform its work in the beſt manner, and with the leaſt labour poſſible. So that, whe- ther we conſider the importance of the plough, or the great nicety of its con- ſtrudion, ît is a ſubje(t very fit for ex- erciſing the genius of the moſt eminent

mechanics