MAGILP′. Syn. Megellup. A mixture of pale linseed oil and mastic varnish, employed by artists as a ‘vehicle’ for their colours. The proportions vary according to the work. It is thinned with turpentine.
MAG′ISTERY. Syn. Magisterium, L. The old name of precipitates. The following are the principal substances to which this term has been applied:—Magistery of alum, hydrate of alumina; M. OF BISMUTH, sub-nitrate of bismuth; M. OF DIAPHORETIC ANTIMONY, washed diaphoretic antimony; M. OF OPIUM (Ludolph’s), crude morphia; M. OF LAPIS CALAMINARIS or M. OF ZINC, hydrated oxide of zinc.
MAGNESIA. See Magnesium, Oxide of.
Magnesia, Hydrate of. (P. Cod.) Syn. Magnesiæ hydras. Obtained by boiling magnesia in 20 or 30 times its weight of water for 20 minutes, draining on a linen cloth and drying. It contains 31 per cent. of water.
Magnesia, Lactate of (Ph. Ger.) Syn. Magnesiæ lactas. Prep. Mix 1 oz. (by weight) of lactic acid in 10 oz. of distilled water, just made slightly warm, and add light carbonate of magnesia enough to neutralise it. Filter and evaporate till crystals form.
MAGNE′SIAN APE′′RIENT (Effervescing). Prep. 1. Heavy carbonate of magnesia, 2 lbs.; tartaric acid and double refined lump sugar, of each 11⁄2 lb.; bicarbonate of soda (dried without heat), 1 lb.; each separately dried and in very fine powder; essential oils of orange and lemon, of each 1⁄2 fl. dr.; mix well in a warm, dry situation, pass the whole through a sieve, put it into warm, dry bottles, and keep them well corked.
2. As the last, but substituting calcined magnesia, 1 lb., for the heavy carbonate, and adding sugar, 3⁄4 lb. The preceding furnish a very pleasant effervescing saline draught.
3. (Moxon’s.)—a. Take of sulphate of magnesia, 2 lbs.; dry it by a gradually increased heat, powder, add of tartaric acid (also dried and powdered), 11⁄4 lb.; calcined magnesia, 1⁄2 lb.; finely powdered white sugar, 3 lbs.; bicarbonate of soda (dried without heat), 1 lb.; essence of lemon, 1 dr.; mix, and proceed as before.
b. (Durande.) Carbonate of magnesia, 1 part; bicarbonate of soda, tartrate of soda and potassa (sel de Seignette), and tartaric acid, of each 2 parts; mix as before.
c. (Pharm. Journ.) Sulphate of magnesia and bicarbonate of soda, of each 1 lb.; tartaric acid, 1⁄2 lb.; mix as before. The last two are much less agreeable than the others.