Hardening

(hard' -en-ing). A stage in the preparation of ti ues for microscopic examination. See Alcohol , Ammonium Chromate, Ammonium Bichromate, Pota ium Bichromate, gelatin solution. Hartmann's Elixir. An elixir containing camphor 50 parts, and saffron I part, in alcohol 350 parts. H.'s Tubes, small tubes devised to be pa ed through a perforated drum-membrane for the purpose of irrigating and draining the middle-ear cavity. Hartshorn. I. Comu cervi. 2. A name popularly given to ammonium hydrate. See Ammonium . Midler's Fluid, Erlicki's Fluid, Chromic Acid, Klein s Fluid, Rabl's Fluid, Corrosive Sublimate, Picric Acid, in Stains, Table of. Alcohol for pieces under I inch square, and the bichromate solutions for larger ma es, are best for general use; others in special cases; but in all, full twenty times the bulk of the object should be used. See Stains, Table of Harder's Glands. See Gland . Hare's Method. A method of determining the position on the skull corresponding to the fi ure of Rolando. The pre-Rolandic region occupies 55.7 per cent, of the distance from the glabella to the inion.