Contractions. - Chlor-hyd. Cl-h.

Present name. - Chloral Hydrate. C2Hc13o,H1O.

This substance may be obtained pure from the operative chemists.

Characters and Tests. - In colourless crystals, which do not deliquesce on exposure to air. It has a pungent, but not an acrid odour, and a pungent and rather bitter taste. On the application of a gentle heat, it fuses to a colourless transparent liquid, which, as it cools, begins to solidify at a temperature of about 120°. It boils in a test-tube, with pieces of broken glass immersed in it, at about 205°, and at a slightly higher temperature it volatilizes on platinum foil without residue. Soluble in less than its own weight of distilled water, rectified spirit, or ether, and in four times its weight of chloroform. The aqueous solution is neutral, or but slightly acid to test-paper. A solution in chloroform when mixed by agitation with Sulphuric Acid does not impart colour to the acid. 100 grains of Hydrate of Chloral dissolved in 1 ounce of distilled water, and mixed with 30 grains of slaked lime, submitted to careful distillation with a suitable apparatus, should yield not less than 70 grains of chloroform.

Reference to Horn. Proving. - Hale's New Remedies; see also paper by Dr. Dyce Brown in Annals of the British Homoeopathic Society, vol. vii.

Preparation. - Solution in distilled water to which 5 per cent. of rectified spirit has been added.