Cadmium, Sul′phate of. CdSO4. Syn. Cad′mii sul′phas, Cad′mium sulphu′ricum, Klapro′thrium sulphu′ricum, L. Prep. 1. From carbonate or oxide of cadmium and dilute sulphuric acid, as the chloride.
2. (Cottereau.) Oxide of cadmium, 1 oz.; sulphuric acid, q. s.; dissolve, evaporate, and crystallise.
3. (Pereira.) Sulphuric acid, 61⁄2 parts; water, 15 parts; mix; add cadmium, 7 parts; dissolve, evaporate to dryness, redissolve in water, filter, and evaporate by a gentle heat, so that crystals may form.
Prop., &c. Efflorescent, rectangular, prismatic crystals; very soluble in water; tastes astringent. It is about 4 times as strong as sulphate of zinc, and is used in similar cases. Dose, 3 to 10 gr. Externally (1⁄2 to 3 or 4 gr. to water, 1 oz.); in specks of the eye, opacity of the cornea, chronic ophthalmia, &c. As an ointment, 10 to 12 gr. to lard, 1 oz.
Cadmium, Sul′phide of. CdS. Syn. Cadmium yellow. This occurs native as Greenock′ite. It may be prepared artificially, either by fusing its elements together, or by passing a stream of sulphuretted hydrogen through a solution of the chloride, nitrate, or sulphate. When prepared artificially, it is of a bright yellow or orange colour, and is of great value to the artist. It has been used in making fireworks. See Fires, Coloured.
Cadmium, Yellow. See Cadmium, Sulphide of (above), and Yellow Pigments.
CÆSALPINA (GUILANDINA) BONDUCELLA. (Ind. Ph.) Habitat. Tropical portions of both hemispheres.—Officinal part. The seeds (Bonducellæ semina, Bonduc seeds); of a somewhat irregular sub-spherical or ovoid form, usually from 5⁄8 to 6⁄8 of an inch in diameter, smooth, hard, and lead-coloured, and contain an amylaceous white nucleus, having a bitter taste. They contain a fixed oil, resin, and a bitter principle.—Properties. Tonic and antiperiodic.—Therapeutic uses. In intermittent fevers; also in debility, and other cases requiring tonics.—Dose, 10 to 15 grains twice daily.
Compound Powder of Bonduc (Pulvis Bonducellæ compositus). Take of bonduc seeds, deprived of their shells and powdered, 1 oz.; black pepper, powdered, 1 oz. Mix thoroughly, and keep in a well-stoppered bottle.—Dose, 15 to 30 gr., three times a day.
CÆSIUM. [Eng., L.] Cæ. A metal belonging to the alkaline group, discovered by Bunsen in the mineral water of Durckheim by means of SPECTRUM ANALYSIS (which see), and so named by him from cæsius, greyish-blue, the colour of its characteristic ray.
CAFFE′IC ACID. Syn. Chloroge′nic acid. A white powder, discovered by Runge in coffee, in which it exists in combination with potassium (caffeiate of potassium), and caffeine, and is then very soluble in alcohol. Pfaff states that the aroma of coffee is dependent on the volatilisation, or, rather, the decomposition of this acid.