Experiments and Observations on the Following Subjects; 1. on the Preparation, Calcination, and Medicinal Uses of Magnesia Alba. 2. on the Solvent Qualities of Calcined Magnesia. 3. on the Variety in the Solvent Powers of Quick-Lime, When Used in Differen

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1773 Excerpt: ... CHAP. XI. A REVIEW OF THE GENERAL CONCLUSIONS DEDUCIBLE FROM THE FOREGOING OBSERVATIONS AND EXPERIMENTS. i. Hp'HE due preparation of A Magnesia Alba depends on the proper mixture of the alkaline lixivium with the folution of the fal catharticus amarus; on the precipitated powder being immediately thrown into a K 4 very very large quantity of boiling wa-= ter; on the purity of the water ufed in the procefs; on the expe ditious drying of the medicine, and on an exacl: attention to cleanlinefs. 2, The artificial Epfom fait, or fal cathartkus amarus affords Magnefia, at leaft, equally pure with that obtained from the Epfom waters; and as the writers// on mineral waters mention thofe of Epfom to contain be/ides their fait, a confiderable quantity of unneutralized earth, which appears, from Dr. putty's experiments, to be calcareous, they fhould feem peculiarly unfit for the purpofe of preparing Magnefia. Some of the Epfom Magnejia being calcined, impregnated diftilled (a) Allen, Lucas, Rutty, Monro, &c. jdiftilled water with a calcareous Dearth. 3. A fufficiently ftrong and well purified lixivium of potafhes is equally adapted to procure the precipitation of Magnefia, as a ley made with fait of tartar, or any other fixed alkali. 4. Magnesia Alba differs effentially in its chemical and medicinal properties from every other known abforbent earth; and when mixed with an acid, either before or after its admiffion into the ftomach, is purgative in a muchfmaller quantity than chalk, crab's eyes, or any of the calcareous or teftaceous earths. 5. The calcination of Magneiia diverts it of thofe difagreeable properties properties complained of by Hoffman, and other practitioners; the fixed air which conftitutes fo great a ftiare of its compofition, and is the caufe of the ...