It is characterized by the following relations of the fibrin in its coagulation and exudation.

The coagula - engendered in the death-agony - are, in the heart, either clod-like, cord-like, more or less compact masses prolonged into the bloodvessels, or where the energy of the heart's systole has been broken long prior to death, and the mortal struggle protracted, membranaceous, lining the heart's cavities or insinuating themselves in the shape of fangs amongst the trabecule. When developed during life, they appear, in the heart, as the liquefying so-called globular vegetations; in wide-calibred bloodvessels, as cylindrical and plugging, or as membranaceous, coagula loosely attached to the internal membrane of the bloodvessel; in capillary ranges, as obstructions of the texture varying in circumference. They are either pure fibrin or contain more or fewer blood-globules, incorporated with them during the act of precipitation. In the former case, they are marked by their opacity, by their dull white, yellowish, or yellowish-green coloration. In the latter case, they are likewise opaque, but, according to the amount of contained blood-globules, more or less reddened.

A closer inspection shows the coagula to consist of a glebous-like, fibro-glebous blastema, or of a faintly striated, membranous basement, - like the inner, the fenestrate, bloodvessel membrane, bestrewn with point-molecule, with numerous granulated, grayish nuclei or nucleus-like formations, and with similar granulated cells. All the nucleus formations are uninfluenced by acetic acid, except that a slight shrinking takes place, and that they acquire a somewhat sharper outline. Not unfrequently the entire coagulum seems to consist of these nucleus- and cell-formations, along with a proportion of point-molecule. [See "Fibrin 3."]

The metamorphosis of these coagula consists for the most part in a tolerably rapid liquefaction of the blastema to a puriform, tenacious fluid holding the aforesaid form-elements in suspension.

The exudates, reflecting the hyperinotic condition of the blood, are generally very abundant, even to the exhaustion of the fibrin. They are reddened in a degree conformable with the amount of extravasated blood which they have incorporated, - as, for instance, in hepatization of the lung. Or they are of a grayish-yellow with a slight shade of green, and opaque. Their metamorphosis consists, possibly with textural transformation of any organizable portion, in disintegration and liquefaction of the blastema to a pus-like, tenacious fluid. [See "Croupous Exudate a."]