This is seen, when a Bushel of Turneps, mixed with a Quantity of Wheaten Flour, is made into Bread, and well baked: This Bushel of Turneps gives but few Ounces Increase in Weight, more than the same Quantity of Wheaten Flour made into Bread, and baked without any Turneps. This shews there is in a Turnep very little Earth (which is the most permanent Substance of a Plant); the Oven discharges in Vapour near all but the largest Vessels: Its earthly Substance being so small, is a Proof ’tis maintained by a small Quantity of Earth: and, upon that Account also, of less Damage to the next Crop than another Plant would be, which required more of the solid Nourishment to constitute its firmer Body, as a Charlock does; for when a Charlock comes up, contiguous to, and at the same time with a Turnep, it does so rob the Turnep, that it attains not to be of the Weight of Five Ounces; when a single Turnep, having no more Scope of Ground, and, in all respects (but the Vicinity of the Charlock), equal, weighs Five Pounds, yet that Charlock does not weigh One Pound. And where Three Turneps coming up, and growing thus contiguous, will weigh Four Pounds; a Charlock joined with Two or Three Turneps, all together, will be less than one Pound, upon no less Space of Ground. This Observation cannot be made, except where Turneps are drilled in Rows; and there ’tis easy to demonstrate, that a Charlock, during the time of its short Life, draws much more Earth than a Turnep of equal Bulk, from an equal Quantity of Ground[212]. [212] ’Tis certain that Turneps, when they stand for Seed, suck and impoverish the Ground exceedingly: For though they are of a cold Constitution, and consequently consume less Food than Plants of an hotter Constitution, and of the same Bulk; yet these Seed-turneps being of so vast a Bulk, as sometimes Eighty Quarters of their Roots grow on an Acre, and their Stalks have been measured Seven Feet high, and their Roots having continued at near their full Bigness for about Ten Months together, and then carried off, they drain the Land more than a Crop of other Vegetables of a less Bulk, and an hotter Constitution, and which live a less time; or than Wheat, which, though it lives as long, is very small, except in the Four last Months.