. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. OIL-BEARING PLANTS OIL-BEARING PLANTS 497 hyde. After a sufficient time has elapsed for the oil to form, distillation occurs. California is the chief American source of this very volatile and poisonous oil. Caraway. [See Medicinal, Condimental and Aro- matic Plants, page 460.] Long-leaf Pine {Pinus palustris,'!iiU\[.). Conifera;. Fig. 723; also Fig. 55, Vol. L American turpenti
. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. OIL-BEARING PLANTS OIL-BEARING PLANTS 497 hyde. After a sufficient time has elapsed for the oil to form, distillation occurs. California is the chief American source of this very volatile and poisonous oil. Caraway. [See Medicinal, Condimental and Aro- matic Plants, page 460.] Long-leaf Pine {Pinus palustris,'!iiU\[.). Conifera;. Fig. 723; also Fig. 55, Vol. L American turpentine oil consists of the more volatile constituents of the resinous exudate ob- tained by wounding the trunk of the various species of pine, chiefly the long-leaf pine. The outer living wood is chopped away in such manner as to open a large area of young wood rich in turpentine. During the warm months this pitch exudes and runs down into a pot connected by spout to the tree or into a "box" cut in the trunk itself, from which it is removed every month or fortnight. The pitch is then distilled, with the result that the more volatile part, the oil of turpentine, is separated from a heavy residue, the resin. This volatile oil is further purified by recti- fication. The southeastern states, from North Carolina to Florida, are the chief source of American turpen- tine oil. Wilmington, N. C, is the chief commer- cial center for this and related pine products, such as resin and tar. The turpentine supply is threat- ened in the United States by the destruction of the forests. Synthetic substitutes have not been secured. Spearmint (Menthaviridis, Linn., M. spicata, Linn.). Labiatce. (Fig. 1392, Cyclopedia of American Horticulture.) A low perennial herb (one to three feet high) propagated by numerous running rootstocks, with ascending or reclining, somewhat hairy, square- cornered, green stems, bearing slightly hairy, aro- matic, sessile, veiny, oblong leaves, and the dense, narro
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