File:Elements of pathological anatomy (1845) (14780543364).jpg

Identifier: 62130990R.nlm.nih.gov
Title: Elements of pathological anatomy
Year: 1845 (1840s)
Authors: Gross, Samuel D. (Samuel David), 1805-1884
Subjects: Pathologic Processes
Publisher: Philadelphia : Ed. Barrington & Geo. D. Haswell
Contributing Library: U.S. National Library of Medicine
Digitizing Sponsor: Open Knowledge Commons, U.S. National Library of Medicine

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kness, firmly connected with the cir-cumjacent tissues, and furnished with minute vessels ; generally, however, itis remarkably thin, soft, flocculent, and without the least visible trace of or-ganization. This variety of melanosis occurs most commonly in the liverand the brain. It is extremely rare. Carswell states that he has never seenan instance of it, and Laennec appears to have met with it only twice. I havenoticed it repeatedly in the liver of the ox. The lamellated variety is observed chiefly in the inferior animals ; it is ex-tremely rare in the human subject. (PL II., Fig. 3.) It is confined exclusively tothe serous membranes, where it is usually deposited into the connecting cellulartissue, in small, irregular patches, of a black brownish color. More rarelythe matter is poured out upon the free surface of these textures. When thishappens, the layer is seldom more than half a line in thickness, of a soft, pulpy Plate If Fip, / TuAeriform v. Fig. JZ. Pediuu:n&z£ed< v.
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FORM— DIATHESIS. 145 consistence, and covered with a thin, transparent pellicle of new formation.The peritonaeum is the most common seat of the lamellated variety of melanosis ;and here it is often difficult to distinguish it from the spurious form of the dis-ease, caused by the deposition of blood, and the subsequent changes whichthis fluid undergoes from contact with the acid contents of the alimentary tube.In some instances the serous membranes present a stained appearance, as ifthe heterologous matter had been effused into their intermolecular spaces.Such spots are not infrequent in the peritonaeum of those who die of ascites. In the dot-like variety (PI. II., Fig. 4,) the melanotic matter appears insmall points, thousands of which are sometimes scattered over the surface ofthe affected organ, giving it a singularly speckled aspect. This form of thedisease, which may be easily imitated by dusting a piece of white paper withsoot or powdered charcoal, is most common in the lungs,

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