. A practical treatise on diseases of the skin, for the use of students and practitioners. ves the details of such an epidemic in Ferney-Voltaire, where twenty-six cases of the disease came under his obser-vation. In some of these instances the lesions were pustular, in otherstuberculo-pustular. Aggravated forms of the disease often originatein the lower animals, the severest and most rebellious types beingderived usually from the horse. Tinea circinata occurs much morefrequently in children than in adults, presumably from the relativelytender condition of the epidermis in these subjects. It i
. A practical treatise on diseases of the skin, for the use of students and practitioners. ves the details of such an epidemic in Ferney-Voltaire, where twenty-six cases of the disease came under his obser-vation. In some of these instances the lesions were pustular, in otherstuberculo-pustular. Aggravated forms of the disease often originatein the lower animals, the severest and most rebellious types beingderived usually from the horse. Tinea circinata occurs much morefrequently in children than in adults, presumably from the relativelytender condition of the epidermis in these subjects. It is particularlyliable to occur in men whose skins are especially moistened, as in thosewho work in atmospheres saturated with steam. Several members ofa single household will often display ringworm of the body at the sametime, having transmitted it, the one to the other. The need of anappropriate soil for the germination of the fungus is shown by the factthat some individuals are predisposed to its invasion. It is, however,encountered in both sexes and in all social conditions. Fig. Epidermis invaded by trichophyton: a, inferior portion of the stratum corneum; 6, superiorportion of the rete. Both exhibit long mycelial threads, with a few ramifications and a smallnumber of spores (after Kaposi). Pathology. The seat of the fungus in tinea circinata is between thestrata of the epidermis, more particularly in the lower layers of thestratum corneum, and in the superior layers of the rete. Herethe trichophyton can be discovered with the microscope, at an earlystage of the disease, in the form of spores only; in the course of afew weeks exhibiting characteristic mycelium. The latter is muchmore scantily developed than in favus; much less branched and artic-ular; and the threads more slender. Like the elements in favus,however, these are jointed and divided into compound cells bypartition-walls. The spores are also often strung together like the Lyon Medical, April 24, 1881, p. 590
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