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.

    218/320 (page 206)
    Hydrocarbons. a. White slender acicular crystals. 394. Caoutchoucine. a. Brownish oily liquid. Note.—This liquid, according to Greville Williams, is a mixture of the two polymeric hydrocarbons caoutchin, C10 H16 and isoprene, C5 Hs. 395. Cooroongite. (Mineral Caoutchouc). a. Blackish, slightly elastic, solid. BENZENE SERIES. HaC2ll_6. a. Coal tar. b. Wood tar. (Stockholm Tar.) c. Light oil of tar, sp. gr. 0'945. d. Heavy oil of tar, sp. gr. P002. Note.— Specimen 6 and c were prepared by Professor Eedwood. e. Eblanin. C6Hg02. (Pyroxanthin.) Note.—This specimen was prepared by the action of hydrate of potas- sium upon heavy oil of wood tar. See Watts, Diet. Chem., vol. iv., p. 776. /. Pitch. g. Asphalt, from an Egyptian mummy. Note.—The above specimens, with the exception of Eblanin, are inde- finite mixtures of various hydrocarbons belonging chiefly to the aromatic group represented by the formula O H 2n - 6. The asphalt obtained from mummies is used by artists as a brown water-colour. This specimen was presented by Messrs. Hearon, Squire, and Francis. 396. Benzene. C6H6. (Biearburet of Hydrogen, Benzole, Benzine.) a. Impure, from coal-tar oil. b. Purified, by crystallization at 10°Fahr. 397. Nitrobenzene. C6H5 (N02). (Oil of Mirbane, Artificial Oil of Almonds.) a. Yellowish oily liquid, crude. b. Purified. Note.—For means of distinguishing this liquid from essential oil of almonds, see Attfield, Chemistry. 398. Dinitro-benzene. C6 H4 (N02)2. a. In acicular crystals. Note.—In this specimen the crystals, which were originally white, have become of a brown colour. 399. Toluene. C7 H8. (Toluol, Methyl-Benzene, Hydride of Benzyl, Benzoene Bracyl, Hydride of Tolyl or Toluenyl.) a. Volatile colourless liquid. 400. Xylene. C8 H10. (Xylol, Dimethyl-Benzene.) a. Colourless volatile liquid. Note.—For usee, etc., see P. J. [3], vol. ii., p. 625.