Principles of organic and physiological chemistry / by Carl Löwig ; translated by Daniel Breed.

  • Carl Jacob Löwig
Date:
1853
Catalogue details

Licence: Public Domain Mark

Credit: Principles of organic and physiological chemistry / by Carl Löwig ; translated by Daniel Breed. Source: Wellcome Collection.

    466/494 (page 458)
    as well as in venous blood, and to determine the yellow color of the serum. It differs from luematin in its solubility in water, alcohol, and ether. In the blood of Malsena this coloring matter is said to occur in large quantity ; it is, without doubt, a product of the decomposition of luematin. 3. Ilcematoklin. Haematoidin. In ligatured bloodvessels and in extravasation, are found small crystals, sometimes yellow, sometimes red, which are insoluble in water, alcohol, ether, acetic acid, in dilute mineral acids, and in dilute alkalies ; they are called haematoidin, and do not always appear to contain iron. Pigmentum nigrum occuli (Augenschwarz), is found, mixed with mucus (schleim), in the eye of man and of the inferior ani¬ mals. In order to obtain it, the choroidea of the ox, bearing the Pigmentum nigrum, is taken out, prepared, and laid in pure water until the latter is no longer colored. The pigment is then stripped off with a hair pencil under water. A black, dull-look- ing, inodorous, and tasteless powder, which is dissolved in pure potassa in the heat, under evolution of ammonia. It is a mixture of different substances. The so-called ink of the cuttlefish (genus Sepia) is a similar coloring matter. Gall-Brown (Cholepyrrhin). The color of the Coloring mat- ga]l is due to a brownish-yellow coloring matter, Gall-°brownSa which, however, cannot be separated from the gall without decomposition. If a fluid containing this coloring matter be, by degrees, mixed with nitric acid, it assumes, successively, a brownish, green, violet, red, and at last, yellow color. This substance is occasionally found, as a muddy deposit, in the gall, or collected as a concretion, forming gall-stones, which show the above-mentioned reaction with nitric acid. It possesses a yellow, or reddish-brown color, is infusible, tasteless, and in¬ odorous, insoluble in water. Dissolves in potassa, with yellow color ; the solution assumes a green color in the air, under pro¬ duction of leaf-green. The so-called gall-yelloio (Bilifulvin, Bilifulvinic Acid) arises, probably, from gall-brown. Also in urine are found several color¬ ing matters, whose nature, however, is not yet known. Gall-yellow. Coloring mat¬ ters of urine.