oxide, magnesium oxide, and ferric oxide, present in the substance examined. In most cases these results will be sufficient to show the quality of the limestone for the purpose of making mortar or cement.
The filtrate and the washings are mixed together, and ammonia is added in excess; the bulky, reddish-brown precipitate is collected, washed, dried, ignited, and weighed. This gives the per-centage of ferric oxide.
The filtrate from last is then treated with oxalate of ammonium, and the quantity of lime determined in the manner described under the head of Calcium.
The liquid filtered from the precipitate in last is boiled for some time with carbonate of potassium until ammoniacal fumes are no longer evolved; the precipitate is then collected on a filter, washed with hot water, dried, and strongly ignited for 3 or 4 hours, and, lastly, weighed. This gives the per-centage of magnesium.
LINC′TUS. [L., Eng.] Syn. Loch, Lohoch, Lincture, Lambative; Looch, Fr. A medicine of the consistence of honey, intended to be licked off a spoon. This form of medicine is well adapted to females and children, but is not much used in England at the present time. Those employed in modern pharmacy and prescribing are included under the heads Confection, Conserve, or Electuary.—The Dose, when it is not otherwise stated, is a teaspoonful occasionally.
Linctus, Acid. (Dr Copland.) Syn. Linctus acidus. Prep. Honey of roses, 10 dr.; hydrochloric acid, 20 minims; syrup of red poppies, 2 dr. Mix.
Linctus of Borax. (Univ. Coll. Hosp.) Syn. Linctus boracis. Prep. Borax, 3 dr.; honey, 1 oz. Melt, and stir together, and then add syrup, 1 oz.
Linctus, Caca′o. Syn. Linctus cacao, L.; Crême de Tronchin, Fr. Prep. From cocoa-butter, 2 oz.; white sugar (in powder), syrup of capillaire, and syrup of tolu, of each 1 oz.; mix. Demulcent and pectoral; in coughs, sore throats, hoarseness, &c.
Linctus, Common. Prep. From oil of almonds and syrup of tolu, of each 1 oz.; powdered white sugar, 2 dr. As the last.
Linctus, Cough. Syn. Pectoral linctus; Linctus pectoralis, L. Prep. 1. (Dr Latham.) Compound ipecacuanha powder (Dover’s powder), 1⁄2 dr.; compound tragacanth powder, 2 dr.; syrup of tolu, confection of hips, and simple oxymel, of each 1 oz.—Dose, 1 teaspoonful, 3 or 4 times a day. “This linctus has been extensively used, as a remedy for coughs, in the West-end of London, having been found to be a safe and generally efficacious remedy.” (Redwood.) The preceding as well as the following are also useful preparations.