cal'cium

[L. calx{calc-), chalk.] A metallic dyad element, of a lustrous yellow color, symbol Ca, atomic weight 40.09, The oxide of calcium is an alkaline earth, CaO, quick lime, which on the addition of water becomes calcium hydrate, Ca(OH),, slaked lime. Several of the salts of calcium are employed in medicine, cal'cii benzo'as, calcium benzoate, in colorle efflorescent crystals, soluble in 20 parts of water, employed as an internal antiseptic and in albuminuria, in doses of gr. 5-10 (0.3-0.6). cal'cii betanaph'thol sulpho'nas, calcium beta naphthol sulphonate, a reddish-white powder, used in rheumatism, gout, and neuralgia in doses of gr. s—^5 (°-3—i-o). cal'cii bc'ras, calcium borate, a white insoluble powder, applied locally for bums, moist eczema, etc., and given internally for the diarrhea of children in doses of gr. 2-5 (0.13-0.3). cal'cii bro'midum (U.S.), calcium bromide, a white deliquescent granular salt, employed to meet the same indications as pota ium bromide, in doses of gr- 5-30 (° 3-2 o). cal'cii car'bidum, calcium carbide, occurs in blackish crystalline lumps; when in contact with water it yields acetylene gas; has been used locally to check fetor and discharge in cancer of the uterus, cal'cii carbo'- nas prscipita'tus (U.S.), precipitated calcium carbonate, creta ptsecipitata, precipitated chalk, a fine white impalpable powder, employed in diarrhea as an antacid in doses of gr. 10-30 (0.6- 2.0). cal'cii chlo'ridum (U.S. and Br.), calcium chloride, occurs as translucent inodorous, deliquescent ma es, of a sharp, bitter, saline taste; used to increase the coagulability of the blood in hemophilia and purpura, in doses of gr. 2-15 (o. 13-1.0). cal'cii glycerophos'phas (U.S.), a white crystalline powder soluble in 20 parts of water; em-