One of these hollow Pieces of Wood is shewn in _Fig._ 15. The Breadth of its Hollow must conform to the Breadth of the Standards, which are One Inch and a quarter broad; but we must allow about a quarter of an Inch more in the Hollow for the Swelling of the Wood. The Depth of the Hollow must be the Thickness of the Standard that is to go in it, allowing about the Eighth of an Inch for the Swelling of the Wood. The Hollow should be a little deeper in the Middle than at each End; because the Standard ought not to bear against any thing, except at or near the upper and lower Part of the Carriage. Altho’ the End of these Pieces come a little higher than the Carriage in this Hopper, yet I think it is better that these hollow Pieces come no higher than even with the Top, nor descend any lower than even with the Bottom of the Carriage; and then the Length of each of these Pieces need be no more than Eleven Inches, which is the whole Depth of the Carriage. The Wood on each Side of the Hollow, sufficient for the Holes _a_, _a_, _a_, _a_, must be about half an inch broad. The best way for fixing them on, is whilst the Standards are in them, placing a small Piece of Wood at each Corner of the Hollow, betwixt the Standard and the Wood, to the end that there may be no more room on one Side of a Standard than on the other Side; then screw them on (parallel to and equidistant from their respective Ends of the Carriage) by Four small Screws each, the one at _c_, _c_, _c_, _c_, and the other at _d_, _d_, with Two below; the Heads of these Screws being on the Inside of the Carriage, and their Nuts on the Outsides of the hollow Pieces; then pull out those little Pieces of Wood, that were to keep the Standards in the Middle of the Hollows, whilst the Holes for the Screws were bored, and then the Turnep-Hopper is finished, and being put on upon the Standards A, B, in _Fig._ 16. is ready to go to Work; and in this Figure the whole Turnep-drill may be seen as in the Prospect of a Person following it at Work, except that this Figure has not the double Standard, nor Marking-wheels; because we never use them for drilling-Turneps, except it be on the Level, which we very rarely do. The Circles of the Wheels of this Hopper go Twenty five Inches asunder; were they farther asunder, they would not go so well upon the Ridges; or were they nearer together, they might not hold up the Plough so steadily, but that one Wheel might happen to be rais’d from the Ground, by the descending of the opposite Limber; and if it should happen to be the Wheel that turns the Crank, no Seed would be deliver’d out whilst the Wheel was rais’d above the Ground; sometimes we use Wheels of Twenty-six Inches Diameter, sometimes Thirty, and at intermediate Diameters, with this Hopper. The best Wood for making all Sorts of Hoppers is Walnut-tree or Elm; our Beams and Standards we make of Ash. [Illustration: _Plate. V._ _P.392_ _B.Cole Delin et Sculp_]