Weisner's Tests

Tests for lignin. The specimen is first acted on by hydrochloric acid, and then moistened with a solution of phloroglucin in water and alcohol. If the cell-walls are lignified, they will at once a ume a red color. Hohnel suggests the employment of a strong decoction of cherry-wood instead of phloroglucin. Used in the same way, it imparts a violet color to lignified cells (Goodale). Wei ' Reflex. A peculiar curved reflex seen with the ophthalmoscope parallel with and to the nasal side of the papilla or disc of the fundus of the eye. It is thought to be a sign of myopia. Wei mann's Ahnenplasma. See Heredity , Wei mann,s Theory of. W.'s Theory. See Blastogenesis, Germ-plasm, and Heredity.