Ranvier's

figures which cruciform brownish-black Cro es, appear at each node of Ranvier in preparations of The silver nerve-ti ue stained with silver nitrate. diffuses into the nerve-fiber only at the nodes, stains with one internode joining cement-substance the bar of the the transverse thus forming another, cro , and as it diffuses along the axis-cylinder stains the cement-substance on the latter for a short distance, R.'s Lemon-juice and so makes the vertical bar. Small Method, a method of tracing nerve-fibers. pieces of ti ue, inch square, are soaked in lemon juice 5 or io minutes, washed quickly in distilled water, and placed in I per cent, solution of gold chlorid for from io minutes to I hour, according to the density Wash in water, place in 50 c.c. water of the ti ue. containing two drops of acetic acid, and expose to the light; or, if it is not desired.to keep the superficial epithelium, after treating with lemon-juice and gold the ti ue is placed for 24 hours in formic acid diluted with three times its volume R.'s of water, and kept in the dark (after Squire). See Stains, See ATode. R.'s Pic roc arm in. Nodes. Table of. R.'s Tactile Discs, nerve-endings consisting of small, cup-shaped bodies, the concave side of which is always directed toward the free surface of the epidermis. They are those tactile corpuscles of Merkel, also of Grandy, which terminate, not in the cells, but in the intercellular substances.