. A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . rnand Central Mexico, from one town of whicli it has re-ceived its name (Jalapa). Jalap was known and broughtto Etuope as early as the beginning of the sixteenth cent-ury, if not before. Its botanical source was demon-strated first in the early part of this century, by Dr. Coxe,of Philadelphia. The collection of jalap is carried on without much re-gard to season. The tubercles are dug up and dried byartificial heat, the smaller ones entire, the larger scored(usual
. A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . rnand Central Mexico, from one town of whicli it has re-ceived its name (Jalapa). Jalap was known and broughtto Etuope as early as the beginning of the sixteenth cent-ury, if not before. Its botanical source was demon-strated first in the early part of this century, by Dr. Coxe,of Philadelphia. The collection of jalap is carried on without much re-gard to season. The tubercles are dug up and dried byartificial heat, the smaller ones entire, the larger scored(usually lengthwise), or split or sliced. The heat em-ployed is often sufficient to break the starch granules, 240 REFEHENCE IIAXDBUUK OF THE MEDRAL SCIENCES. J n I k » u * and so, when dry, the texture is often horuy, ou accountof the hardened starch mucilage, irrespectively of theamount of resin contained. The cultivation of Jalap isin its infancy. DESCRirTiox.—Tlie jalap tubercles are in part de-scribed above: the Ph:irmacopa=ial description is as fol-lows: Isapiform, pyriform, or oblong, varying in size;. Fig. -976.—Jalap Boots. (Balllon.) the larger roots incised, more or less wrinkled, darkbrown, with lighter-colored spots, and short, transverseridges: hard, compact, internally pale grayish-brown,with numerous concentric circles of smallresin cells; fracture resinous, not fibrous: odor slight,but peculiar, smoky and sweetish; taste sweetish andacrid. On exhausting 100 parts of jahip with alcohol, concen-trating the tincture to 40 parts, and pouring it into water,a precipitate of resin should be obtained, which, whenwashed with water and dried, should weigh not lessthan 12 parts, and of which not over ten per cent, shouldbe soluble in ether, It is said that this requirement of twelve per cent, ofresin is e.\cessive and difficult, if not impossible, to attainin the commercial drug. Probaljly eight or nine or, atmost, ten (as in the Britisli Pharmacopce
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