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.

    463/494 (page 455)
    pulverizable. If wo accurately saturate the acetic acid solution with ammonia it is precipitated. Crystallin is said to contain no phosphorus. In the red blood corpuscles a fluid is Globulin, found inclosed which consists of the coloring matter of the blood and a protein compound. This fluid is said to be identical with crystallin ; according to other accounts, it is a special protein combination, which has been called globulin. 5. Horn-Tissues. To the horn-tissues belong uornstructure hair, nails, horn, claws, and farther, the epidermis and epithelium. These substances dissolve completely by boiling with potash ; upon the addition of acids a lively evolution of hydrosulphuric acid follows ; hair contains 5 per cent, of sulphur. Fibroin: N6C39II310]7 (?). We obtain this sub¬ stance if raw silk or gossamer be successively‘boiled Appendix to the in alcohol, water, and acetic acid, and the residue ^’ouVuls ° 'U~ again boiled with water until it no longer reacts acid. It is white, elastic, insoluble in acetic acid; it dissolves in hydro¬ chloric and concentrated sulphuric acid, and is precipitated from its solution by tannin. Soluble in strong potassa solution, and again preeipitable, unchanged, by dilution with water. The prin¬ cipal part of the sponge is said to be a combination of fibroin with iodine, sulphur, and phosphorus. Chitin: N6,33C,6,69II6,6?O,0,89, is the horny sub- Chitin_ stance of the articulata; it is obtained if the sheath, wings, and shields of the beetle, the shell of the crab, of the lob¬ ster, spider, etc., be successively extracted with water, alcohol, ether, and dilute potassa solution. It is white, and of the form of the original tissue. Is dissolved in hydrochloric and in nitric acid without change of color. Drenched in concentrated sulphuric acid, it swells up and liquefies without blackening. Insoluble in concentrated potassa solution. Second Group. TISSUES AFFORDING GLUE AND CIIONDRIN. GLUE AND CIIONDRIN. The tissues which furnish glue and chondrin are found only in animal bodies. To these belong all J^and dnfn- parts of the animal organism formed of ligamentous driu. tissue, as the tendons, ligaments, fascirn, the fibrous tissue, the true skin, the cartilaginous tissue, and, in part, the elastic tissues. These substances are insoluble in water. The ligamentous tissue swells up in acetic acid; the cartilaginous tissue, as well as the fibres of the elastic tissues, do not change in acetic