A peculiar organic compound, found both in animals and vegetables, but procured however, in its most characteristic state, from animal matter. To obtain it, we may beat blood as it issues from the veins with a bundle of twigs. Fibrin soon attaches itself to each stem, under the form of long reddish filaments, which become white by washing them. It is solid, white, insipid, without smell, insoluble in water, softens in the air, becoming viscid, brown, and semi-transparent. Fibrin does not putrefy speedily when kept under water. It shrinks on exposure to a considerable heat, and emits the smell of burning horn.