_Uses, &c._ The moist hydrate is used in several processes in the arts. It is the base of cobalt-blue, the lake-pigments, &c. In _medicine_, it is employed as an antacid and astringent, in acidity of the stomach, cholera, diarrhœa, and dysentery; in which it is said to be superior to the other absorbent remedies. (Ficinus.) It has also been highly recommended in the vomiting and diarrhœa of infancy. (Durr; Neumann; Weese; &c.)——_Dose._ Children 3 to 10 gr.; adults, 5 or 6 to 20 or even 30 gr., three to six times daily, suspended in water, by mucilage or simple syrup. =Aluminum, Sil′icate of.= Al_{2}(SiO_{2})_{3}. _Syn._ SIL′ICATE OF ALUMINA. A substance which, in its hydrous form, is the chief and characteristic ingredient of common clay; and which also occurs, in combination, in several other important and abundant minerals. =Aluminum, Sul′phate of.= Al_{2}(SO_{4})_{3}. _Syn._ SESQUISUL′PHATE OF ALUMINA, NEUTRAL S. OF A., ALU′MINÆ SUL′PHAS, A. SESQUISUL′PHAS, L. _Prep._ 1. Saturate dilute sulphuric acid with hydrate of aluminum, gently evaporate, and crystallise. 2. (Crude, commercial.) By mixing clay and oil of vitriol, in the way described under ALUM. The product is the ‘CONCENTRATED ALUM’ of the dyers. _Prop._ Its crystals are needles and thin pearly plates; soluble in 2 parts of water; taste astringent, and somewhat sweetish; reaction acid; a full red heat expels its acid, leaving a residuum of pure alumina; with the sulphates of potassium, sodium, and ammonium, it forms alum. _Uses, &c._ In the _arts_, chiefly as a substitute for alum; the sulphate of potassium in the latter, being found to be an unnecessary and costly ingredient, only useful to purify the salt from iron, by forming a compound of easy crystallisation; an object that may be effected with greater certainty by cheaper methods. In _medicine_, as a wash for foul and ill-conditioned ulcers; and as an astringent and antiseptic injection. M. Gannal has successfully employed a solution of this salt to preserve animal bodies, by throwing it into the arteries. Even an enema of 1 quart of it, or an injection of a like quantity into the œsophagus, will suffice to preserve a body for several weeks. The mineral called AL′UNITE or ALU′MINITE, found near Newhaven (Sussex), is a native subsulphate or basic sulphate (DISUL′PHATE) of alumina. =Aluminum, Sulphide of.= Al_{2}S_{3}. _Syn._ SUL′PHIDE OF ALUMINIUM, &c. A substance best obtained by passing the vapour of bisulphide of carbon over pure alumina, at a bright red heat. It is instantly decomposed by water, with the evolution of sulphuretted hydrogen. See ALUMINUM (_above_).