The Exudate offers in regard to its so-called tuberculization, certain points of interest, as observed most particularly upon serous tunics.

(a.) In the first place, only a portion of the entire exudate appears as tubercle, whilst the remainder becomes gradually reabsorbed and disappears. Or else this latter changes into a texture, - to areolar tissue, to a fibroid vascularized texture, often to a redundantly vascular, fibro-cellular new growth, or to a spurious membrane of similar structure. The two allotments may be present in very different quantitative proportions, the one or the other predominating in various measure. The more texture-formation prevails, the more does the tuberculizing portion take the form of scattered miliary granulations, up to more voluminous nodules imbedded in the organized new growth. The more scant the textural formation, the more prone is the tuberculizing portion to represent a confluent, uniform, granulating, stellate, clavate tubercle-mass or layer.

The tubercularizing new growths, as vascularized pseudo-membranes, often become themselves the seat of inflammation, for the most part productive of hemorrhagic exudates of a tuberculous nature.

(b.) In the second case, the entire solid exudate, remarkable for its bulk, is tubercle; or the organizable portion is imperceptibly small, and disappears. It forms in considerable, irregular, shapeless masses; or, on membranous expansions, smooth, or stellate, stella-clavate layers.

The tubercle thrown out as a consequence of inflammation, is the gray, or it may be the yellow, or again a combination of both. The fibrino-croupous yellow tubercle is especially often the product of inflammation, and especially marked by its abundance. It occurs everywhere, constituting, upon membranous formations, the aforesaid stellate layers; within muco-membranous canals and cavities of inconsiderable calibre, as, for example, the uterus, the tubse, the seminal vesicles, - thoroughly closing plugs; in compact parenchymata, - lesser or greater, roundish or irregular knobs; in the lung-cells and in follicles, - smaller coagula.

Tubercle produced by inflammation generally passes speedily into softening, and thus to a phthisis of the textures, marked by the acuteness of its course; and, as pneumonic tubercle infiltration, by the jagged, eroded look of the cavities; lastly, by the not unfrequent supervention of pulmonary gangrene.