. A practical treatise on diseases of the skin, for the use of students and practitioners. ous infectionwhich results from long exposure of the parts to the air. It is throughthese fistulous orifices that in different cases exit is given to a blackishfish-roe-like substance, or to a whitish material, or even still morerarely, as indicated above, to a reddish substance. In place of nodules or papules, the skin may be the seat of pustules,of vesicles, of bullae, or even of abscesses. When but relatively smallregions of the body are invaded, such as a finger or a toe, it becomesclear that the tum
. A practical treatise on diseases of the skin, for the use of students and practitioners. ous infectionwhich results from long exposure of the parts to the air. It is throughthese fistulous orifices that in different cases exit is given to a blackishfish-roe-like substance, or to a whitish material, or even still morerarely, as indicated above, to a reddish substance. In place of nodules or papules, the skin may be the seat of pustules,of vesicles, of bullae, or even of abscesses. When but relatively smallregions of the body are invaded, such as a finger or a toe, it becomesclear that the tumefaction is not due chiefly to an hypertrophy eitherof the integument or the bones. Etiology. The disease, though of more common occurrence in Indiathan elsewhere, may develop in other lands. The relatively fre-quent involvement of men is probably due to the greater exposuresof the bare feet in persons of that sex. The disease is due withoutquestion to the access to the tissues of a special vegetable parasite, and,as far as is known, usually through the portal of a traumatism. Fig. Osseous lesions in mycetoma. (From a photograph.) Pathology. The discovery of a fungus by Vandyke Carter (namedfrom him the Chionyphe Carter!) and the later belief that the parasiteof mycetoma was identical with that of actinomyces have been suc-ceeded by a series of investigations which show with clearness thatactinomyces is related to but not identical with the fungus of the microscope the lobate-reniform masses constituting the grains7 recognized in the last-named disorder are seen to be formed PARASITIC AFFECTIONS. 747 by a dense centrally placed mycelium with peripheral filaments whichradiate very uniformly from within outward, and which may or maynot terminate in clubs, these last being probably the resultant ofthe interplay of force between the outspreading fungus on the one handand the resisting power of the tissues on the other. In the three areas to be equally recognized
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Keywords: ., bookauthorhydejamesnevins184019, bookcentury1800, bookdecade1890
