48 Of the Coultét« 4. In tlieſe two figures, it appears that the upper and under corners, E G, of the farrow flice, made by the plough, fig. 5. are ſquare, whereas the two cor- ners, R and N of che flice made by the plough of fig. 4. are about 13 degrees above the ſquare. In order‘that the furrow may ſtand in this poſition, ic muſt cicher lean upon the former fur- row, or it muft be ſupported by looſe earth, which tumbles in below it, and fills up the vacancy repreſented by H GK of fg: 8. or PRS fig. 9: Ic is caſy to ſce, that the vacancy of fig. 8. is eaſier made up than the other. Although this poſition of the furrow ſlice is not always required, it-being ſometimes thought proper to leave it ſtanding upon its edge G H, it 1s plain,

that