Tache

(tahsh). A spot, a coloration. T. blanches, certain white spots described by Hanot as occurring on the liver, especially on its convex surface, in infectious diseases. Microscopically they present a leukocytic infiltration with bacteria. T., bleuatre, a spot of a delicate-blue tint, sometimes observed on the skin of typhoid-fever patients. The spots are of an irregularly rounded form, and from three to eight lines in diameter; not elevated above the skin, nor affected by pre ure. They are must common on abdomen, back, and thighs. They usually precede the characteristic eruption of typhoid fever. Ts. cerebra les, irregular, red, angio-paralytic patches upon the skin, noticed in some cases of epilepsy; also, the spot on the blastoderm about the end of the first week, which becomes the center of embryonic development. T. mening eale, the red line made when the finger-nail is drawn over the skin. It was thought to be distinctive of meningeal irritation, but may be observed in other conditions of vaso-motor paresis.