300 VIII. ACIDS.— Of Ants. 



in the manufacture of oil of vitriol, so that it is seldom made on 

 purpose. 



Iodine, lode, lodium. Extract all the soluble part of kelp by 

 water, and crystallize the soda by evaporation ; to the mother ley 

 add oil of vitriol to excess and boil the liquid, then strain it to 

 separate some sulphur, and mix the filtered liquor with as much 

 manganese as there was oil of vitriol used : on applying the heat, 

 the iodine sublimes in the form of greyish black scales, with a 

 metallic lustre ; stimulant, gr. ss, daily ; specific in bronchocele, 

 and advantageously given, in order to remove morbid growths and 

 tumours; also in paralysis; but its action must be carefully 

 watched, as it produces gastric irritations, and emaciation. Several 

 practitioners have derived benefit from its employment in the 

 various species of scrofula, in tubercular affections of the chest 

 and abdomen ; also as an emmenagogue. Latterly iodine has 

 been employed in the treatment of syphilitic buboes, and in 

 gonorrhoea ; in lucorrhoea ; also some cases of cancer are said to 

 have been cured by it. It may be administered in the form of 

 tincture, or dissolved in water (iodated or iorduretted waters.) 



Solution of iodine. Iodine gr. j, distilled water 1 pint; 

 dissolve : solution orange yellow. Used as a test for starch, with 

 which it produces a purple colour, and as one of the best modes 

 of prescribing the iodine. 



Iodic acid, Acidum iodicum. UifFuse iodine in water, and 

 pass chlorine gas through the mixture, until it becomes clear and 

 colourless ; evaporate to a semitransparent white saline mass. 



Tannin, Tannic acid. Nutgalls lib., infuse in distilled water, 

 strain, add hydrochlorate of tin as long as any sediment is pro- 

 duced, wash, diffuse the sediment in water, and pass hydrosul- 

 phuric gas, from artificial sulphuret of iron while dissolving in 

 dilute muriatic acid, through the water; filter, evaporate to 

 dryness, and dissolve in water. Used as a test for gelatine. 



Fiedler's gallic acid. Blue nutgalls lib., water 2 gall., 

 boil to 1 gall. ; strain. Dissolve alum ^Ib. in water, add subcar- 

 bonate of potash as long as any sediment falls, wash this sediment 

 well, and add it to the decoction of galls; next day filter, wash 

 the sediment till the washing no longer strikes a black colour 

 with copperas water, mix the washings wath filtered liquor, eva- 

 porate and crystallize. The liquid acid used as a test for iron 

 and titanium, and to distinguish strontian from barytes. 



OF ANIMAL ORIGIN. 



Acid of ants, Acidum formicarum. Ants lb. j, boiling water 

 lb. iiij ; infuse for three hours, press out the liquor, and strain : 

 stimulant. Used as a lotion in impotency. 



