Of the Coulter. I3 The dimenſions of the coulter may be as follows: An eighth of an inch thickneß at the edge, and an inch thick at the back, for a three horſe plough, or ſeven-cighths for a two horſe plough, The web may be three inches broad at the broadeſt, and taper from a foot down all the way to the point, The thickneſs of the back may taper alſo. The length is about twenty inches. It may e a little rounding on the fur- row fide, from the edge to the middle, and ſhould be flat on the land ſide. The operation of the coulter depends greatly upon its poſition, The plough may be conſidered as a ſort of wedge, employed to remove the earth both from the land ſide and from the bottom of

the furrow. The land ſide and bottom

of