The chloride of ammonium in vapor deserves trial in obstinate cases of this kind, and Dr. H. Beigel introduced an arrangement of three bottles, one containing liquor ammonia, another hydrochloric acid, and a third "wash-bottle" with water, through which air impregnated with the vapor was drawn for inhalation (Lancet, ii., 1867): it has not come into general use. Liebermann has suggested another form of apparatus for inhaling it (Bulletin de Thera-peutique, 1873).

The bromide is of service in capillary bronchitis (Bartholow), in pertussis, and other spasmodic coughs.

The chloride in lozenge and vapor has also been advised for hoarseness and granular sore throat, but the stimulus at first sometimes aggravates the symptoms.