28 A N BE Seo AT

itt. The whole conftruction of this inftru-

ment marks its being intended for a foil in

the moft uncultivated ftate, abounding

with obftru€tions of every kind. The great length of the part that moves below the furface, and the exceflive ftrength and weight of all its paris, plainly fhow the great occafion that the contrivers had: to prevent its being turned afide, or broken to pieces by the numerous and obftinate interruptions to which it was expoied. The elevation alfo of the hinder part ot the mould-board, and the tapering of the hare; evidently imply a foil fo hard, or fo clofely bound together by the roots of vegetables, as to rife entire and unbroken.

The original contrivance of this machine might be extremely well adapted to the cir- cumftances in which it was firft'employed, and certainly is fo fill to the fituation in which it is generally ufed; but it feems im- proper to continue to employ it of the fame fize and weight, where the circumftances that gave occafion to that ftrong and heavy conftruction have no longer exiftence, and in foils that have attained a confiderable de-

gree of cultivation. From

+ See fig. 7;