Preparation. - By heating camphor with bromine and crystallising from petroleum benzin.

Characters. - Colourless, prismatic needles or scales, permanent in air, unaffected by light, having a mild camphoraceous odour and taste, and a neutral reaction.

Solubility. - Almost insoluble in water, freely soluble in alcohol, ether, chloroform, hot benzin, and fixed oils; slightly soluble in glycerine.

Dose. - 2 to 10 grains. It may be given in pills, made by rubbing 5 grains with 1 grain of Canada balsam in a warm mortar.

Action. - Like other bromides it produces weakness and paralysis, stupor and sleep. It slows the pulse (p. 316) and respiration and reduces the temperature. In the rabbit the vessels of the eye and ear are contracted. When given for a length of time it produces marked emaciation.

Uses. - Monobromated camphor has been used as a sedative instead of the bromides, but it is less efficient. It has been recommended in insomnia, chorea, hysteria, and delirium tremens. In large doses it has caused epileptiform convulsions, like camphor.