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Of the Coulter.[9 a real advantage is gained. When the point of the coulter projets much be- low, it cuts the ground partly upwards, in which direétion îts coheſion is moſt eaſily overcome. Alſo, when the coul- ter comes to tough roots, which it docs not cute at the firſt touch, it preſſes for- ward below them, fMrains, and tears them with the increaſed force of a wedge, and at laſt breaks them, with much greater eaſe than if its edge were upright. By this means too

a very tough root is made to ſlide up

along the coulter, till it comes to that

part of its edge, which is not much em- ployed in cutting the farrow, and is therefore ſharper than the reſt. E the roots being cut by different parts of

the coulter, as they differ in ſtrength,

and