. A practical treatise on diseases of the skin, for the use of students and practitioners . ren are, the use upon the headsof the unaffected of brushes, combs, wearing apparel, sponges,towels, etc., which have been employed upon persons exhibitingringworm of thebody or head. It must be remembered thattinea circinata may transmit tinea tonsurans; and it is bytracing the course of the two forms of the disease, that thesources of contagion can be ascertained in any series of disease is one rather prevailing in the cities than in thecountry; and in this respect also differs from favus. 1
. A practical treatise on diseases of the skin, for the use of students and practitioners . ren are, the use upon the headsof the unaffected of brushes, combs, wearing apparel, sponges,towels, etc., which have been employed upon persons exhibitingringworm of thebody or head. It must be remembered thattinea circinata may transmit tinea tonsurans; and it is bytracing the course of the two forms of the disease, that thesources of contagion can be ascertained in any series of disease is one rather prevailing in the cities than in thecountry; and in this respect also differs from favus. 1 Lancet, 1831, p. 326. 2 Id., 1880, p. 303. 3 Loc. cit. 520 DISEASES OF THE SKIN. Pathology.—The disease is produced in consequence of the in-vasion of the Bcalp, and follicles, bulbs, and shafts of the hair, bythe trichophyton, the fungus already described as the cause oftinea cireinata. This vegetable mould is much more abundantlydeveloped about the hairs than theachorion Schonleinii, and itspresence is hence much more readily demonstrated in thesestructures. Pie. 55. ■■^rc m^ Hair invaded by the trichophyton. Robinson1 has lately excised a portion of a scalp affected withtinea tonsurans; and found the stratum corneum, especially inits upper layers, largely invaded by spores, as also the rete, theexternal root-sheath of the hairs in its upper portion, the corium,and subcutaneous tissues. Mycelia were abundant in the mucouslayer. He concludes that the anatomical seat of the disease dif-iers in different cases. Under the microscope the hairs themselves, in advanced cases,are seen to be greatly altered. The bulbs are distorted, mis-shapen, or withered, and often stuffed with spores which greatlypredominate over the mycelia. At times the base of the bulbwill show a brush-like expansion, and in this respect resemblethe free ends of the stumps of the hairs above, which have ajagged, bristle like appearance, from the division of the shaftinto many filaments between which sp
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