Practical pathology; a manual for students and practitioners . mass there may be a ragged cavity bounded by sloughy looking walls. Harden (^ 62 or 63), stain (§ 103, 104, or 106), and mount a section(§§ 193 and 199),—another, on which should be a piece of the pleura,and which should pass through several lobules,—unstained (§ 195). ( X 50).—The [jleura is divided into two distinct layers, the moresuperficial of which is but slightly pigmented at any point, and isapparently little changed. Between it and the deep layer, which issometimes three or four times the normal thickness, is a sharp lineo
Practical pathology; a manual for students and practitioners . mass there may be a ragged cavity bounded by sloughy looking walls. Harden (^ 62 or 63), stain (§ 103, 104, or 106), and mount a section(§§ 193 and 199),—another, on which should be a piece of the pleura,and which should pass through several lobules,—unstained (§ 195). ( X 50).—The [jleura is divided into two distinct layers, the moresuperficial of which is but slightly pigmented at any point, and isapparently little changed. Between it and the deep layer, which issometimes three or four times the normal thickness, is a sharp lineof demarcation. Throughout the thickened deep layer are blackpatches, which evidently follow the lines of the lymphatics, especially ANTHRACOSIS 469 around the blood vessels; these patches are sharply bounded by thewalls of the lymph spaces or sinuses. The interlobular septa continuous with the deep layer of the pleuraare also considerably thickened, and their lymphatics are similarlyinjected with black pigment. From them the black lines and patches. Fic. 141.—Section of coal-miners lung, to show position ofcarbon pigment. Stained with alum carmine. (x20.) a. Superficial layer of pleura, unpigmented. li. Deep layer of pleura, in the lymphatics of which a large quantity of pigment has Interlobular septum, pigmented at margins. (In lymphatics of connective tissue.)/. Small bronchi with thickened and pigmented walls.(/. Vessel with pigmented adventitia. In all these pigmented areas there is great increase in the amounl of connective tissue, so that each is hard and firm, and, from the amount of pigment that has accumulated in the lynij)!! spaces, gritty. ay be traced into the perivascular and peribronchial tissue, as theI)eribronchial lymphatics arc in direct communication with those in thesepta, and thus with those in the deep layer of the pleura. The mucousmembrane of the bronchus is entirely free from pigment of any kind,though it is frequently swoll
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