The American Therapist Volume 1-2

The American Therapist Volume 1-2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...grow luxuriously without oxygen that is, without atmospheric air, when they are in a fluid capable of fermentation with them. If these forms are placed in a less favorable nutrient fluid in which they cannot incite fermentation, they will not grow without a supply of oxygen from the air " (p. 54). Tyndall, in treating of "the action of the yeast plant under different conditions," says, "let it be sown in a fermentable liquid, which is supplied with plenty of pure air, the plant will flourish, and produce large quantities of carbonic acid gas but we hardly find a trace of alcohol. The yeast has grown and flourished, but it has almost ceased to be a ferment." When confined in a close vessel "with a single small aperture open to the air, through which it is observed not to imbibe oxygen, but to pour forth carbonic acid, it may be made to "display its characteristic quality." Here "the small quantity of atmospheric air dissolved in Ihe wort and overlying it, would be totally incompetent to supply the necessary oxygen. In no other way can the yeast-plant obtain the gas necessary for its respiration than by wrenching it from the surrounding substances, in which the oxygen exists, not free, but in a state of combination." "As defined by Pasteur fermentation is life without air." 'But here the knowledge of that thorough investigator comes to our aid to warn us against possible error. It is not, he says, all yeast-cells that can thus live without air and provoke fermentation. They must be young cells, which have caught their vegetative vigor from contact with free oxygen. But once possessed of this vigor, the yeast, he alleges, may be transplanted into a saccharine infusion absolutely purged of...show more

Product details

  • Paperback | 474 pages
  • 189 x 246 x 24mm | 839g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236544986
  • 9781236544988