Magnesium. Magnesium. 



Incompatibility, soluble salts of magnesium in strong solutions are pre- 

 cipitated by the hydrates of the alkalies and the alkaline earths; alkali car- 

 bonates, phosphates, arsenates; sulphides, oxalatcs, tartrates. 



2 Magnesia Levis. Light Magnesia. (Light Calcined Magnesia, 

 Light Magnesium Oxide.) Dose, if repeated, 5-30 grs.; 3-20 dgms.: 

 for a single administration, 30-60 grs.; 2-4 gms. 

 A bulky white powder. Insoluble in water. 



2 Magnesia Ponderosa. Heavy Magnesia. (Heavy Calcined 

 Magnesia, Heavy Magnesium Oxide.) Dose, as above for the Light Mag- 

 nesia. 



A white powder insoluble in water. Differs in weight only from the 

 Light Magnesia, the same weight having only 2/7 of the volume of that 

 of the Light. 



^agnesii Carbonas Levis. Light Magnesium Carbonate. Dose 

 as for Light Magnesia. 

 A very light powder. Insoluble in water. 



^agnesii Carbonas Ponderosus. Dose, as for Light Mag- 

 nesia. 

 A heavy white powder. Insoluble in water. 



^agnesii Sulphas (Epsom Salt). Dose, if repeated, 30-120 

 grs.; 2-8 gms.: for a single administration 1/4-^ oz.; 8-15 gms. 

 Small, colourless crystals, with a bitter taste. Soluble, 10 in 13 of wafer, 

 insoluble in acohol. 



2 Magnesii Sulphas Eflervescens. Dose, if repeated, 60-240 

 grs.; 4-16 gms.: for a single administration, I /L-\ oz.; 15-30 gms. 

 50; Sodium Bicarbonate, 36; Tartaric Acid, 19; Citric Acid, 12.5; Sugar, 

 10.5. 



3 Liquor Magnesii Carbonatis. Dose, 1-2 fl. oz.; 30-60 c.c. 

 Magnesium Sulphate, 10; Sodium Carbonate, 12.5; Water to 100. 



Mel Depuratum. Clarified Honey. The honey of commerce melted 

 and strained through flannel. 



2 Oxymel. Oxymel. Dose, 1-2 fl. dr.; 4-8 c.c. 

 80; Acetic Acid, 10; Water to 100. 



Mellita (see Boron p. 42). 



Menthol. Menthol. Dose, l A-2 grs.; 3-12 cgms. 



HCHs.CsHT. A saturated secondary alcohol obtained from vari- 

 ous species of Mentha. Colourless, brittle crystals, with a strong odour 

 of peppermint, and a warm aromatic taste followed by a sensation of cold 

 on drawing air into the mouth. Almost insoluble in water and glycerin, 



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