. Elements of pathological anatomy. Anatomy. 374 SKIN. [chap. Fisr. 39.* or several of these substances conjoined, (Figs. 37 and 38.) The mouth of the „. „„ r ,r i v • i Pig. 37.* Fig. 38.+ iollicles being ob- structed, and the natural secretion going on, their cavity gradually expands, until the sac acquires, in some instances, the volume of an ap- ple, or even of a cocoanut. The parietes of these tumors are occasionally quite hard and thick, like the dura mater : and cases have been observed, though I believe very rarely, in which they were ossified, or transformed into fibro- cartilage,
. Elements of pathological anatomy. Anatomy. 374 SKIN. [chap. Fisr. 39.* or several of these substances conjoined, (Figs. 37 and 38.) The mouth of the „. „„ r ,r i v • i Pig. 37.* Fig. 38.+ iollicles being ob- structed, and the natural secretion going on, their cavity gradually expands, until the sac acquires, in some instances, the volume of an ap- ple, or even of a cocoanut. The parietes of these tumors are occasionally quite hard and thick, like the dura mater : and cases have been observed, though I believe very rarely, in which they were ossified, or transformed into fibro- cartilage, (Fig. 39.) Externally, they are rough, being connected to the surround- ing parts by cellular tissue ; whereas, internally, they are generally smooth and glistening. Small sacs are sometimes observed in the interior of these tumors j but these I suppose are rare, and I have never met with them. In their shape, these tumors are for the most part globular, and they are found more frequently, by far, on the face and scalp than in any other situation. Their number, although usually small, is sometimes very great. In a case which fell under my notice, nine years ago, I counted several hundred on the head and trunk of a man about forty years of age. He informed me that most of them commenced when he was quite young, soon after bathing in cold water, and that he had never experienced the slightest pain from them. The tumors were of the melieerie kind, and the largest were about the volume of a hen's egg, the surface of many being uneven, and here and there incrusted with hard, sebaceous matter, of a darker color. Tumors of this kind are commonly somewhat movable, though in this respect much depends upon their Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gross, Samuel D. (Samuel David), 1805-1
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