. The principles of surgery . perienced and judicious surgeon, encountering anexample of fungus hsematodes, finds himself constrained to non-inter-ference, and has to content himself with palliating what he cannot cure. 12. The Melanotic Tumour.—The deposition of pigmentarymatter of black or brownish colour, in various organs or tissues, is notnecessarily connected with malignant disease. A common form inwhich it occurs, is in the lungs; where it constitutes a species ofspurious melanosis, dependent on the infiltration of carbon into thetissue. With this we have nothing todo. The pigment which
. The principles of surgery . perienced and judicious surgeon, encountering anexample of fungus hsematodes, finds himself constrained to non-inter-ference, and has to content himself with palliating what he cannot cure. 12. The Melanotic Tumour.—The deposition of pigmentarymatter of black or brownish colour, in various organs or tissues, is notnecessarily connected with malignant disease. A common form inwhich it occurs, is in the lungs; where it constitutes a species ofspurious melanosis, dependent on the infiltration of carbon into thetissue. With this we have nothing todo. The pigment which enters intothe formation of tumours is of a dif-ferent character; it is in some wayformed from the blood, like that of thechoroid coat of the eye, and, unlikethe carbonaceous pigment, is readilydecomposed by nitric acid, with the aidof heat. It forms brownish or blackgranules under the microscope, tendingto the angular form, and of very varioussize—from the minutest molecule tothe size of a blood-corpuscle. When Fig. Fig. 85. Cells more or less loaded with black pigment, from a melanotic tumour ofthe cheek.—Bennett. 326 COLLOID CANCER. this pigmentary matter occurs in a distinct tumour, and is infiltratedinto its cells, we have the disease at present under consideration; whichmust not be confounded with those dark-coloured deposits which takeplace in many textures, without tumour, and without any other altera-tion of nutrition. This disease occurs much more rarely in man than in the loweranimals—particularly the horse. It is to be observed, however, that inanimals the malignant character of the affection is not so well markcilas in man. Like other tumours, it is the result of perverted nutrition;a thorough change of structure. It occurs in areolar tissue; moreespecially in that connected with the serous membranes. Sometimesit is pure ; more frequently it is complicated; and the morbid structurewith which it is most frequently associated, is the medullary. Theexter
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