An introduction to clinical medicineSix lectures on the method of examining patients; percussion, auscultation, the use of the microscope, and the diagnosis of skin diseases . per seated cells. Fig, 84 —The same, after the addition of acetic acid APPLICATIONS OF THE MICROSCOPE TO DIAGNOSIS. 121 Fig-. 85. ^^0^^ scales passing into fibres, and, deeper seated, either groupsof younger cells, or concentriclayers of aggregated scales, suchas those formerly figured inan ulcer of the tongue. () The cancerous ulcer of theskin is often dithcult to distin-guish microscopically from theepithelial u
An introduction to clinical medicineSix lectures on the method of examining patients; percussion, auscultation, the use of the microscope, and the diagnosis of skin diseases . per seated cells. Fig, 84 —The same, after the addition of acetic acid APPLICATIONS OF THE MICROSCOPE TO DIAGNOSIS. 121 Fig-. 85. ^^0^^ scales passing into fibres, and, deeper seated, either groupsof younger cells, or concentriclayers of aggregated scales, suchas those formerly figured inan ulcer of the tongue. () The cancerous ulcer of theskin is often dithcult to distin-guish microscopically from theepithelial ulcer, because the ex-ternal layer, like it, is oftencomposed of softened , however, a drop of can-cerous juice can be squeezedfrom the surface, it is found tocontain groups of cancer cells,which, from their general ap-pearance, may for the most partbe easily distinguished. Con-siderable experience, however,in the knowledge, and skill inthe demonstration, of cancerousand cancroid growths, are ne-cessary in order to pronounceconfidently on this point, and. tothis end an acquaintance withthe whole subject of the his-tology of morbid growths is es-sential.^. Fig. 85.—Appearance of section of cancerous ulcer of the skin,—a, Epi-dermic scales and fusiform corpuscles on the external surface, h, Group ofepidermic scales, c, Fibro-elastic tissue of the dermis, d. Cancer cellsinfiltrated into the fibrous tissue, and filling up the loculi of dermis. See the Authors Treatise on Cancerous and Cancroid Growths. 122 THE CLASSIFICATION OF CUTANEOUS DISEASES. LECTURE YI. THE CLASSIFICATION AND DIAGNOSIS OF CUTANEOUSDISEASES. Notwithstanding the great advances which have heen madein our knowledge of diseases of the skin, it cannot be deniedthat very inexact notions prevail regarding this class of dis-orders. I do not here allude to the eruptive fevers, which, fromtheir frequency and danger, necessarily demand the attentionof every professional man, so much as to th
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