[864] See the ingenious experiments of Dalibert in Mémoires présentées sur les Mathématiques et la Physique, tom. i. Strong-smelling plants lose their smell in a sandy soil, and do not recover it when transplanted into a rich soil. On this Rozier founds his proposal for improving rape-oil.
[865] Mehler, p. 16, tab. vi.—Kerner, tab. 312.
[866] A good figure is given by Mehler, tab. viii.
[867] See a figure of the Teltow rapes in Kerner, tab. 534.
[868] Geopon. lib. ix. 18, p. 611. The oil of turpentine of the present day is obtained from the resin by distillation, a process with which the ancients were unacquainted.
[869] Columella, ii. 10, 22–25; xi. 3, 60; xii. 54.—Plinius, xx. 4; and xix. 10 and 5. That I may not be too prolix, I shall leave the confusion which occurs in the works of the ancients untouched.
[870] See the figure of the Mayrübe in Kerner, tab. 553; of the Guckelrübe, tab. 516; and Mehler’s tab. vii. (or 37.)
[871] De Re Rustica, lib. ii. cap. 10.
[872] Hist. Nat. lib. xviii. c. 13; lib. xix. c. 5.
[873] Tull’s Horse-Hoeing Husbandry.