IODINE SOLUTIONS 317 



of the iodine. This concentrated solution is diluted with 

 water as required ; the dose is easily ascertained, for the 

 iodide is about half as powerful as the iodine. For intra- 

 tracheal injections, iodine grs. xxxii. ; potassium iodide, grs. 

 clx., are dissolved in three ounces of distilled water, and of 

 this solution fl^xxx. diluted with fl\xlv. of distilled water are 

 injected daily for two or three days, when the quantity of 

 diluent may be gradually reduced and the dose of the pure 

 solution gradually increased to four or five drachms. 



For external purposes the tincture and compound aqueous 

 solution are generally suitable. When gentle stimulation 

 and absorption are desired weak solutions are used. As a 

 counter-irritant about two parts iodine and one of potassium 

 iodide are dissolved in sixteen of water or fatty matters. 

 For reducing bony enlargements iodine ointment is some- 

 times mixed in equal proportion with mercury biniodide 

 ointment. For wounds ten grains each of iodine and potas- 

 sium iodide to an ounce of water usually suffice. Two parts 

 iodine, one part potassium iodide, four wood-tar oil, and 

 thirty-two of lard or oil, make a serviceable mange dressing. 



Tincture of iodine is made with half an ounce each of 

 iodine, potassium iodide, and water, and sufficient alcohol 

 (90 per cent.) to produce twenty ounces of the tincture. 

 Liquor iodi, or Lugol's solution, contains iodine two, potas- 

 sium iodide three, and water forty parts. Unguentum iodi 

 contains 20 grains each of iodine and potassium iodide, 60 

 grains of glycerin, and 400 grains of lard. Glycerin of iodine 

 contains 1 of iodine to 50 of glycerin. An injection for 

 bursse is made with 16 grains each of iodine and potassium 

 iodide, dissolved in an ounce of sterilised glycerin, or dis- 

 tilled water. Tinctura iodi decolorata is made with 250 grains 

 of iodine dissolved, with a gentle heat, in 5| ounces of rectified 

 spirit ; when cold, add 10 drachms of strong solution of 

 ammonia ; and, when decolorised, dilute with sufficient 

 spirit to form 1 pint. Tinctura iodi oleosa is composed of 

 iodine one, rectified spirit nine, and castor oil two parts. 

 This tincture applied as a pigment does not crack the skin 

 (Extra Pharmacopoeia) . 



lodipin (Merck) is a compound of iodine with oil of sesame. 

 It is supplied in two strengths, one containing ten per cent., 



