Scavenger

(skav’-en-jer) [AS., scedwian, to show]. One who cleans; a remover of waste and filth. S. -cells, wandering cells that take up debris. S. -cells are common in the nervous system. Schacher’s Ganglion. The ophthalmic ganglion. Schede’s Method. A method of treating caries of bone. The diseased ti ue is scraped away and the cavity allowed to fill with a blood-clot. The latter is kept moist and aseptic by a covering of gauze and protective. Scheiner’s Experiment. An experiment illustrating refraction and accommodation of the eye. The person looks through two pinholes made in a card and placed at a le distance than the diameter of the pupil. If the eye is emmetropic, or if accurately focused, the two sets of rays, pa ing through the pinholes, unite and form a single image. In a myopic or a hyperopic eye the object appears double. 569