. A practical treatise on diseases of the skin, for the use of students and practitioners . mayhecome the starting point of an epithelioma. Verruca vulgaris is the form most frequently seen upon thefingers and hands, pin-head to pea-sized, usually discolored,papilliform excrescences. Etiology.—The causes of warts are unknown; but in earlychildhood, a period in which they are most frequently encoun-tered, it is reasonable to conclude that they result from externalcontacts. It is when the child begins to handle everythingwithin reach, that they usually first appear, and then about thehands. The
. A practical treatise on diseases of the skin, for the use of students and practitioners . mayhecome the starting point of an epithelioma. Verruca vulgaris is the form most frequently seen upon thefingers and hands, pin-head to pea-sized, usually discolored,papilliform excrescences. Etiology.—The causes of warts are unknown; but in earlychildhood, a period in which they are most frequently encoun-tered, it is reasonable to conclude that they result from externalcontacts. It is when the child begins to handle everythingwithin reach, that they usually first appear, and then about thehands. The acuminate or condylomatous warts are chieflyinduced in parts moistened with a blennorrhagic secretion, butunquestionably may originate from contact with the leucorrhoeal 240 DISEASES OF THE SKIX. orpathological, oon-venereal discharges from the female nave, however, never observed them in virgins of either senile warts are more probably due to obscure changes inthe nutrition of the integument. Pathology.—Warts on section exhibit, microscopically, an hy- Fi«r. IP*** Vertical Bection of the summit of a pointed wart, a, papilla containing vascular loop :o, stratum corneum ; d, uypertrophied rete. (After Kaposi.) pertrophy of the papillary layer of the corium concerned in their iular loopsmi. Above pertrophy ot the papillary layer of the corium concernegrowth, with corresponding development of the vascirising iron; the superior vascular plexus of the coriun: KERATOSES. 241 these papillae the rete is usually largely developed, the epitheliabeiug multiplied not only on the sides of the prolonged papillae,but immediately over their apices. In all the dry varieties thestratum corneum is also hypertrophied, but this more especiallyover the summit of the excrescence. The filiform warts arecomposed chiefly of a slender fasciculus of connective tissuespringing from the bundles below, and covered with an epider-mis which is not apparently altered. Beneath all fo
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