This class of preparations has been official in the British Pharmacopoeias, but is not recognized in the present British Pharmacopoeia, 1898. The preceding British Pharmacopoeia gave directions for the following inhalations: (1) VAPOR ACIDI HYDROCYANICI—Inhalation of hydrocyanic acid; (2) VAPOR CHLORI—Inhalation of chlorine; (3) VAPOR CONINAE—Inhalation of conine; (4) VAPOR CREASOTI—Inhalation of creosote; (5) VAPOR IODI—Inhalation of Iodine and (6) VAPOR OLEO PINI SYLVESTRIS—Inhalation of fir-wool oil.

King's American Dispensatory, 1898, was written by Harvey Wickes Felter, M.D., and John Uri Lloyd, Phr. M., Ph. D.