_Nebula Mentholis Composita (Nebul. Menthol. Co.), Compound Menthol Spray, N.F._--Menthol (1%), camphor (1%), methyl salicylate, eucalyptol and oil of cinnamon in light liquid petrolatum. _Petroxolinum Mentholis (Petrox. Menthol.), Menthol Petroxolin, N.F._ (Menthol Petrox).--Menthol (17%) in liquid petroxolin. =Menyanthes (Menyanth.), Menyanthes, N.F.= (Buckbean, Marsh Trefoil).--Leaves of _Menyanthes trifoliata_. ACTION AND USES: Obsolete bitter; no special indications for its use. DOSAGE: 1 Gm. or 15 grains (N.F.). =*Methylis Salicylas (Methyl. Salicyl.), Methyl Salicylate, U.S.P.= (Oleum Gaultheriae, U.S.P. VIII, Oil of Wintergreen, Oleum Betulae, U.S.P. VIII, Oil of Sweet Birch, Oil of Teaberry).--Produced synthetically or obtained from wintergreen (oil of wintergreen) or from birch (oil of sweet birch). Colorless, yellowish or reddish liquid, with a wintergreen odor and taste. Sparingly soluble in water and miscible with alcohol and glacial acetic acid. ACTION AND USES: Chiefly used as flavor. In sufficient amounts, antirheumatic and antipyretic. DOSAGE: 0.75 Cc. or 12 minims (U.S.P.). May be applied externally either pure or diluted (10%) in ointment. For absorption through the skin is best diluted with a fatty oil. _Petroxolinum Methylis Salicylatis (Petrox. Methyl. Salicyl.), Methyl Salicylate Petroxolin, N.F._ (Methyl Salicylate Petrox).--Methyl salicylate (20%), in liquid petroxolin. =Methylthioninae Chloridum (Methylthionin. Chlor.), Methylthionine Chloride, U.S.P.= (Methylthioninae Hydrochloridum, U.S.P. VIII, Methylene Blue). Dark green powder or crystals with a bronze-like luster. Freely soluble in water and alcohol, forming a deep blue solution. ACTION AND USES: Sometimes used as urinary antiseptic; also in the treatment of malaria and some neuralgic conditions. In the latter use, is of doubtful value. DOSAGE: 0.15 Gm. or 2-1/2 grains (U.S.P.). =Mezereum (Mezereum), Mezereum, U.S.P.= (Mezereon).--A bark. ACTION AND USES: Antiquated antisyphilitic and vesicant. _Fluidextractum Mezerei (Fldext. Mezer.), Fluidextract of Mezereum, N.F._--Mezereum (100%). Absolute alcohol content about 70 per cent. =MISTURAE, MIXTURES.=--Liquid preparations containing insoluble or partly soluble medicinal substances suspended in them. For the various official mixtures, see under the names of the respective principal ingredients. For Mistura Adstringens, see under =Cupri Sulphas=; for Mistura Camphorae Acida, Mistura Carminativa and Mistura Glycyrrhizae Composita, under =Opium=; for Mistura Ferri Composita, under =Ferri Carbonas=; for Mistura Camphorae Aromatica and Mistura Oleo-Balsamica, under =Oleum Lavandulae=; for Mistura Pectoralis Stokes, under =Ammonii Carbonas=. =Morphina (Morphina), Morphine, U.S.P.=--An alkaloid obtained from opium.