. A practical treatise on diseases of the skin, for the use of students and practitioners. ent adenopathy of the subcutaneous glands, and malnutrition inmany forms, which may so impair the vigor of the constitution as toleave the sufferer a physical wreck for the remainder of life. The cutaneous lesions of scarlatina, like those of measles, depend 140 DISEASES OF THE SKIN. upon hyperemia and a moderate degree of exudation. The latter,when it occurs, is limited for the most part to the rete and papil-lary layer of the corium. The signs of the disorder are not appar-ent in the dead body unless t
. A practical treatise on diseases of the skin, for the use of students and practitioners. ent adenopathy of the subcutaneous glands, and malnutrition inmany forms, which may so impair the vigor of the constitution as toleave the sufferer a physical wreck for the remainder of life. The cutaneous lesions of scarlatina, like those of measles, depend 140 DISEASES OF THE SKIN. upon hyperemia and a moderate degree of exudation. The latter,when it occurs, is limited for the most part to the rete and papil-lary layer of the corium. The signs of the disorder are not appar-ent in the dead body unless there have been exudation of blood andthe consequent formation of petechia?. Etiology. The disease is produced exclusively by contagion derivedfrom the animal body affected with scarlatina, either mediately orimmediately. It attacks individuals of both sexes and all ages, chil-dren and infants more frequently, the aged more rarely, probably inconsequence of their respective conditions as regards immunity con-ferred by a previous attack, since, in general, the disease occurs but Fig. Microphotograph of the edge of a small colony of the bacillus scarlatinas :a. Central zone. b. Outer edge of growth. once in a lifetime. Individual idiosyncrasy must acccount for thecases in which unprotected infants exposed to the disease fail to receiveit, a fact noted occasionally in all the exanthemata. The contagiouselement, which is volatile in its nature, seems to be most active duringthe eruptive stage of the disease. Rod-like bodies and mobile points have been found by Reiss, Coze,and Feltz in the blood of patients affected with scarlet fever; andinjection of rabbits with such blood has proved fatal. Jameson andEdington1 have recognized and cultivated the bacillus scarlatina?,which measured in thickness and to in length, and formedlong, jointed, and curved, motile leptothrix filaments. Exceedinglyinteresting clinical facts as to the transmission of scarlatina through Bri
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