. Le manuel de référence des maladies de la peau. er. Elle borde une terrier équidistante entre la surface de l'épiderme et le niveau des papilles du corium.étant empêchée par les poils de son dos de bouger vers l'arrière, elle avance et pond ses œufs. Sa durée de vie est de six semaines à deux mois, et pendant ce temps elle pond une cinquantaine d'oeufs. Ceux-ci éclosent, atteignent la surface de la peau, rencontrent le mâle, deviennent imprégnés, borein leur tour dans la peau, et ainsi de maintenir le processus. Les parties les plus minces de la peau sont le plus facilement perforées, itis Justin ces parties

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. The ready-reference handbook of diseases of the skin. er. It bores a burrow equidistant between the surfaceof the epidermis and the level of the papillae of the corium.Being prevented by the bristles on her back from movingbackward, she moves forward, and lays her eggs. Her dura-tion of life is from six weeks to two months, and during thistime she lays some fifty eggs. These hatch out, reach thesurface of the skin, meet the male, become impregnated, borein their turn into the skin, and so keep up the process. Asthe thinnest parts of the skin are most easily punctured, itis Justin these parts that we find the lesions most commonly. 1 Boston Med. and Surg. Journ., Sept. 23, 1886. SCABIES. 449 The scratching often extends far beyond the sites of theburrows. Fournier found that an acarus died in sevendays when immersed in cold water, in ten days when inwarm water, and in two to four days in a solution of greensoap. He denies the commonly accepted view that theacarus is a night-prowler, though he allows that it is mostactive at night. Fig.52.. Acarus scabiei. Back. Diagnosis. The presence of pustules and scratch-marksbetween the fingers, on the anterior face of the wrists, aboutthe umbilicus, on the breasts in women or the genitals inmen, is enough to make the diagnosis of scabies. If a cunic-ulus can be found, it will be corroborative evidence. Eczemais more patchy and does not occur in the characteristic loca-tions of scabies. Pediculosis vestimentorum presents long, parallel scratch-marks instead of the small excoriations of 450 DISEASES OF THE SKIM scabies, and their characteristic locations are over theshoulders, about the girdle, and along the outside of thearms and the inside of the thighs where the seams of theclothing come. The itching of scabies is worst at night, while that of pediculosis is most marked in the daytime.Urticaria is a general disease characterized by wheals andshows no tendency to localize itself in certain regions. Fig. 53.

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