Except that it will hereafter appear, that the new Nourishment taken at the Extremities of the Roots in the Land _E_, might enable the Plants to send out more new Roots in their own Land, and receive something more from thence. The Row _C_ being twice as big as the Row _D_, must be suppos’d to extend twice as far; and the Row _B_, four times as far, in proportion as it was of a Bulk quadruple to the Row _D_. A _Turnep_ has a Tap-Root, from whence all these Horizontal Roots are deriv’d. And ’tis observable; that betwixt these two Lands there was a Trench, or Furrow, of about the Depth of nine or ten Inches, where these Roots must descend first, and then ascend into the Land _E_: But it must be noted, that some small Quantity of Earth was, by the Harrowing, fall’n into this Furrow, else the Roots could not have pass’d thro’ it. _Roots_ will follow the open Mould[3], by descending perpendicularly, and mounting again in the same manner: As I have observ’d the Roots of a Hedge to do, that have pass’d a steep Ditch two Feet deep, and reach’d the Mould on the other side, and there fill it; and digging Five Feet distant from the Ditch, found the Roots large, tho’ this Mould was very shallow, and no Roots below the good Mould. [3] A Chalk-Pit, contiguous to a Barn, the Area of which being about 40 Perch of Ground, was made clean and swept; so that there was not the Appearance of any Part of a Vegetable, more than in the Barn’s Floor: Straw was thrown from thence into the Pit, for Cattle to lie on; the Dung made thereby was haled away about three Years after the Pit had been cleansed; when, at the Bottom of it, and upon the Top of the Chalk, the Pit was covered all over with Roots, which came from a Witch-Elm, not more than Five or Six Yards in Length, from Top to Bottom, and which was about Five Yards above, and Eleven Yards from the Area of the Pit; so that in three Years the Roots of this Tree extended themselves Eight times the Length of the Tree, beyond the Extremities of the old Roots, at Eleven Yards Distance from the Body: The annual-increased Length of the Roots was near Three times as much as the Height of the Tree.