Catalogue of the collections / Comp. by E.M. Holmes.

  • Pharmaceutical Society of Great Britain. Museum
Date:
1878
Catalogue details

Licence: Public Domain Mark

Credit: Catalogue of the collections / Comp. by E.M. Holmes. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    392. Exogonium purga, Benth; Ipomcea Porga, Hayne. (Vera Cruz Jalap.) a. Root, etc., preserved wet. B. & T., Med. Plants, tab. 186. Note.—This specimen was grown at Clapham, and was presented by Mr. D. Hanbury. It shows the formation of tubercules by the enlargement of roots proceeding from a slender subterranean stem. b. Tubercules, preserved wet. Note.—This specimen was grown in the Botanical Garden of Trinity College, Dublin, and was presented by Dr. Aquila Smith, in May, 1869. c. Tubercules. Two specimens. d. Resin obtained from the tubercules. (Jalapin.) e. Ditto, purified. f /. Large pyriform jalap tubercules. f g. One large globular ditto. Note.—True Jalap is distinguished from Tampico by being usually turnip-shaped or pear-shaped, by its density, by not being shrunken, and by being marked with numerous little transverse scars, which are absent in Tampico Jalap. For culture of, see P. J. [2], vol. viii., p. 651. For valuation of, P. J. [2], vol. ix., p. 487. For resin, P. J. [1], vol. iv., p. 428 ; [2], vol. ix., p. 233. For adulteration of jalap resin, P. J. [1], vol. hi., p. 132 ; [2], vol. iv., p. 326. The root contains 15 per cent, of resin, about 5 per cent, of which is soluble in ether, the rest insoluble. 393. Ipomcea Orizabensis, Ledan. a. Root. (Male or Stalk Jalap, Woody Jalap, Orizaba Boot, Purgo macho of the Mexicans.) Note.—This root contains a resin entirely soluble in ether. See P. J. [1], vol. hi., p. 133 ; [1], vol. xi., p. 521, No. 1; [1], vol. iv., p. 326. 394 Ipomcea species. a. Tubercules. (Jalap with a roseate odour.) Note.—This Jalap much resembles in appearance Tampico Jalap, but occurs in much larger pieces. It was found by Guibourt in French commerce in 1842, and was presented by him. It contains according to his analysis only 3-23 per cent, of resin, about half of which is insoluble in ether. The roseate odour is not now (1875) perceptible. P. J. [1], vol. ii., p. 331. 395. Ipomcea simulans, Hanbury. a. Tubercules. (Tampico Jalap.) Note.—The Tampico Jalap plant was first described by Mr. D. Hanbury, and is figured in the Journ. Linn. Soc, vol. xi. (1870), 279, tab. 2. See also P. J. [2], vol. xi., p. 848. It is distinguished from the true Jalap plant by its corolla being funnel-shaped, and its flower-buds drooping ; the corolla of Exogonium purga is spread out horizontally like a wheel, and the flower-buds are erect. The tubercules are paler, more spongy, and are fusiform in shape. They yield a resin entirely soluble in ether. As imported, the drug often appears to be mixed with true Jalap, which will perhaps account for the different opinions held concerning the solu- bility of its resin in ether. Pharmacographia, p. 402. The tubercules have been mistaken for the roots of Nepaul Aconite. See Aconitum ferox, and P. J. [2], vol. vii., p. 58.