Spiritus Sinapis (N. F.)—Spirit of Mustard.
Preparation.—"Volatile oil of mustard, two grammes (2 Gm.) [31 grs.]; alcohol, one hundred grammes (100 Gm.) [3 ozs. av., 231 grs.]. Mix them. Note.—This preparation is official in the German Pharmacopoeia"—(Nat. Form.).
Action and Medical Uses.—This agent should never be used internally. Externally, it is a powerful rubefacient, and may be cautiously employed where a counter-irritant effect is desired.