Camphor liniment, 3; olive oil, 12; cerate, 85.

Physiological Action. - Externally camphor is stimulant and rubefacient.

Internally in small doses it acts as a carminative, in large doses as an irritant, causing nausea and vomiting. It is diaphoretic and anaphrodisiac, and stimulates the heart (pp. 316, 319). It stimulates the circulation, but may slow the pulse; and stimulates the nerve-centres, causing exhilaration, but finally paralyses them, causing lassitude. It produces, in large doses, a form of delirium, and sometimes death, occasionally preceded by epileptiform convulsions and maniacal excitement. In small doses it is said to be aphrodisiac, and in large doses anaphrodisiac (p. 451). It lowers the temperature.

Uses. - Externally, in the form of liniment, it is applied to sprains, enlarged joints, etc. An ointment of 1 part of camphor to 8 of lard is useful in relieving itching in chronic eczema and urticaria.

Inhalation of its vapour (1/2-1 dr. in 1/2-pint hot water) has been recommended for coryza.

Internally it is used in catarrh and coryza. It is very useful in summer diarrhoea, and may be given in the form of Rubini's solution (1 gr. in 2 min. of absolute alcohol), two to five minims every fifteen minutes. It is also useful in cholera, tympanitic distension of the abdomen, and hysterical vomiting.

It is also used as a nervine stimulant, especially in debility of the respiratory organs; as a nervine and cardiac stimulant in fever, and as an antispasmodic in epilepsy, chorea, pertussis, hysteria, and other nervous affections, especially those connected with the sexual organs.