A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . e dimi-nution in size of the excised piece, which is then nolonger to its former tension. Where the skiupossesses linear cleavage, the tension is in the directionof these lines; but where this condition does not exist, itoccurs uniformly in every direction in the plane of thesurface. The tension likewise depends upon the move-ments of the joints and muscles, the amount of fat de-posited in the subcutaneous tissue, and also upon morbid conditions, such as
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . e dimi-nution in size of the excised piece, which is then nolonger to its former tension. Where the skiupossesses linear cleavage, the tension is in the directionof these lines; but where this condition does not exist, itoccurs uniformly in every direction in the plane of thesurface. The tension likewise depends upon the move-ments of the joints and muscles, the amount of fat de-posited in the subcutaneous tissue, and also upon morbid conditions, such as oedema, or upon the existence of preg-nancy. In this latter condition the degree of tensionmay be so great that a permanent change may result inthe direction in which the bundles of fibres run. Color.—The color of the skin differs according to theindividual, the race, and the age, and it also varies upondifferent portions of the bodv. It cannot be ascribed incertain races to climatic intluences alone, since in thesame zones people of different color are found, as inA frica, negroes, and in a corresponding portion of Amer-. FIG. .);.—Cleavage Lines of tbe Skin. (Langer.) ica, the much lighter colored Indians. The difference iacolor depends entirely upon the amount of pigment pres-ent in the rete Malpighii, where, under the form of gran-ules, it is found especially in its lower layer or stratimibasale. This is easily demonstrable in the skin of thenegro two or three days after death, and before decom-[josition has set in. If the skin is, under such conditions,sharply rubbed, the epidermis is detached and rolls upunder the finger, and the corium or true .skin is seen tobe of a dull white color. In the white race tlie colorchanges, within certain limits, in the various seasons ofthe year. When the skin is exposed to the heat and thesun in summer, there is an inciease in pigment depositand it appears darker, but this disappears and the whitercolor returns in winter. Under
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