The fore Spindle should be of such a Length, that its square Ends, E and F, may come out Three or Four Inches farther than the Hubs (or Stocks) of the Wheels; so that there may be room to shift the Wheels towards either End, for making several Sets of Notches, for the Use of the Seed-box. Observe, Tho’ the fore Hopper is drawn by its Spindle, yet the hinder Spindle is drawn by its Hopper. The Reason of this great Distance between the Two fore Wheels is not so much for their serving as Marking Wheels to this particular Drill; which being drawn only upon a Ridge, its Top is a sufficient Direction for leading the Horse to keep the Rows parallel to one another, if the Ridges are so; but if the Wheels were much nearer together than they are, and yet more than Six Feet asunder, the Wheels going on the Sides of the next Ridges would be apt to turn the Drill out of the Horse-path towards one Side, not permitting the Drill to follow directly after the Horse; and if the Wheels should stand at Six or Seven Feet Distance from one another, then they must go in the Furrows which are on each Side of the Six-feet Ridge: This would occasion their Hopper to bear upon the Plank, which would carry the Wheels above the Ground, and no Seed would be turned out of the Hopper, unless the Wheels were of an extraordinary Height[268]; and the Height requir’d for them would be very uncertain, some Furrows being much deeper than others; but the Tops of contiguous Ridges are generally of an equal Height, whether the Furrows betwixt them be deep or shallow; for we seldom make Ridges of an unequal Height in the same Field: Therefore there can be no need to change the Height of our Wheels, that are to go upon the Middle of the Ridges; but if they went in the Furrows they must be of a different Height when used for drilling of high Ridges, from what would be required when used for drilling low Ridges. [268] Notwithstanding the Reasons given, and that I have never used Wheels of such an Height as might be necessary for going in the Furrows, yet it may not be amiss to try such; because with them the Spindle needeth not to be more than half the Length of one that is carried by low Wheels: And high Wheels will allow the Funnel to be much larger, so that altho’ the Spindle go higher from it, no Seed will drop beside a large Funnel; but there is not room for a large one under low Wheels.