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THE DRILEL: PLOUGH. 607

eight grains of wheat will thus be depoñted in every nine inches of the drills.

7. Now if eight or nine grains were dropped altogether in one inch of ground, they would be too numerous, if they be all fup- pofed to grow, and would form a tuflock; but by making them flide down an.inclined plane, as in the tin-flues, fromthe feed-box to the coulters, which are croffed for the purpofe of lengthening them, as feen.in Plate XI. fig. 2. fome of the feeds will be more de- layed by their friction in defcending than others, and the eight or nine feeds will thence be: difperfed over the whole nine inches of the drill; which renders drill-fowing fuperior to dibbling, as in the latter the feeds are dropped all together.

8. When the holes in the wooden cylinder are completely open, they are about a proper fize for fowing horfe-beans or peas: when they are completely clofed, there will remain a fmall niche at the end of the excavation in the wooden cylinder next to B, Plate XI. fig. 4. for turnip-feed, or other fmall feeds,

For wheat and barley and oats, a wooden wedge fhould be made of the exaét fhape of the area of the hole, which the direétor of the plough requires; who will occafonally infert it into the holes, when he turns the fcrew at the end of the cylinder to enlarge or to leflen them to thefe exact dimenfions.

Thefe wedges fhould be written upon with white paint,. wheat, barley, oats,&c. which will much facilitate the adapting the fize of the excavations to each kind of grain, and may be altered, if required, to fuit larger or lefs feeds of the fame denomination.

o. In fome drill-ploughs, as in Mr. Cook’, there is an additional machinery to mark a line, as the plough proceeds, in which the wheel neareft the laft fown furrow may be directed to pafs at a pro- per diftance from it, and parallel to it. But in fowing wheat or peas and beans this may be done by making the wheels, as they run upon

the ground, to be exa&ly fifty-four inches from each other; and 6 then

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