. A practical treatise on diseases of the skin, for the use of students and practitioners. r host, andhence are not recognized upon the free surface of theintegument. Upon rapid removal of the clothingof an infested individual, a few may occasionally beencountered, hastily seeking a place of refuge, thoughthis is rather the exception to the rule. It thus mayhappen that a louse-bitten patient may not exhibitthe true source of his troubles to his physiciau aftera recent and complete change of clothing. The greater then the im-portance of being able to recognize the clinical features of the malad
. A practical treatise on diseases of the skin, for the use of students and practitioners. r host, andhence are not recognized upon the free surface of theintegument. Upon rapid removal of the clothingof an infested individual, a few may occasionally beencountered, hastily seeking a place of refuge, thoughthis is rather the exception to the rule. It thus mayhappen that a louse-bitten patient may not exhibitthe true source of his troubles to his physiciau aftera recent and complete change of clothing. The greater then the im-portance of being able to recognize the clinical features of the maladyin the absence of the parasite. This recognition is comparatively easyto one who has made himself familiar with the symptoms of the disorder. The manner in which the louse is enabled to supply itself with theblood of man has carefully been studied by Swammerdam, Landois,Schjodte, and Tilbury Fox. The last-named author has summarizedthe observations of the others, and the results he gives may briefly bedescribed as follows : Swammerdams original view that the louse is not provided with. Pediculus corporis— female (after Kuchenmeistee) . 780 DISEASES OF THE SKIN. mandibles by which it can inflict a wound, but with an haustellum bywhich the blood is sucked up to the head of the parasite, is confirmedby Schjodte. This observer, examining the head of the louse frombehind with reflected light, discovered that the parts of the headresembling mandibles in appearance were really situated beneath itsskin. He applied to the integument lice which had been previouslystarved, and watched each as, with retracted limbs, arched back, andhead inclined obliquely downward, it repeatedly projected forward andretracted through the extreme end of its head a small, dark, narroworgan/7 by which it was firmly held in place. A triangular blood-redpoint soon became visible in front of the eyes, rapidly and alternatelycontracting and dilating, and followed by energetic peristalsis of thegastro-intestina
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Keywords: ., bookauthorhydejamesnevins184019, bookcentury1800, bookdecade1890
