Report of the Meetings Volume 49

Report of the Meetings Volume 49

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 edition. Excerpt: ...the easiest mode of obtaining the substance in a stats of purity. When, after these two operations, the alcohol is completely separated, pure cold water extracts the palmelline in the course of about twenty-four hours. By these successive treatments, xanthophyll, chlorophyll, and palmelline are entirely separated, and the Palmella cruenta contains no more colouring matter. III. But both the treatment by water and that by alcohol, as above made known, separate, at the same time as t esubstances already named, small quantities of another very interesting compound, which I have isolated and have termed C/zaracimz. It is the odoriferous substance which is characteristic of fresh water alga, desmida, diatoms, oscillariw, &c., in glelheral, and is highly developed in 'il1z: nts of the genus Chara, giving to all these t t peculiar marshy odour so well own to botanists. This odour is due to a substance produced by the plants (a kind of camphor), and not, as is generally supposed, to some products of their putrefactive decomposition. Oharacine can be extracted from the alcoholic solution, or from the water which has lain over the dry Palmella cruenta for thirty or forty hours. The alcoholic solution is first mixed with about fifteen times its volume of water, and allowed to deposit in a closed tube; the contents of the tube are decanted from the dc sit, an shaken up with a certain quantity of ether. The latter is then separatedoand. evaporated. It leaves the characine in the form of a. colourless greasy substance, having a strong charactenlstic marshy odour. It is soluble in alcohol and ether, almost insoluble in water, to which it communicates its odour; its s cific gravity is less than that of water, on which it floats, producing those thin..show more

Product details

  • Paperback | 342 pages
  • 189 x 246 x 18mm | 612g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123675025X
  • 9781236750259