vi IN FRODUCATION., mechanics and philoſophers in Europe, On the other hand, this is not a taſk which exceeds the powers of our un- derſtanding; and it is not impoſlible to explain the principles upon which the plough fads in performing its work: and, conſequently, to determine that form which ſhall do this in the beſt manner. Let the huſbandmen once be agreed as to the fate în which the ground ſhould be Ieft by the plough, The taſk which it is to perform is now a fixed ching, and there muſt be one manner of performing ît, which is bet- ter than any other. Now, it is certain that a plough may be made which ſhall perform a taſk in any manner what-

ever, and therefore in this beſt INAN

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