318 POTASSIUM IODIDE 



the other twenty-five per cent, of iodine. lodipin (10 per 

 cent.) is a light yellow liquid with a sp. gr. of 1025 ; while 

 the 25 per cent, iodipin is a thick, oily fluid with a sp. gr. 

 of 1227. Both preparations are soluble in ether and chloro- 

 form, and insoluble in alcohol. Given by the mouth iodipin 

 is stated to pass unchanged through the stomach, and in the 

 intestine a small proportion is decomposed, the greater part 

 being absorbed as an intact fat. On the oxidation of iodipin 

 the iodine is taken up by the alkalies of the blood and tissues. 

 Administered subcutaneously iodipin is slowly but regularly 

 absorbed and oxidised. Iodine may be detected in the 

 urine within fifteen minutes after the first dose, and it 

 continues to be excreted for several weeks following the last 

 injection. lodipin is employed as a substitute for the alka- 

 line iodides. It is a valuable medicine in the treatment of 

 actinomycosis, shoulder abscess, scirrhous cord, bronchitis, 

 pulmonary emphysema, purpura, and acute infectious 

 diseases. It is also used as a routine antiseptic. 



DOSES. lodipin 25 per cent., subcutaneously, horses and 

 cattle, j. to ij. per day ; dogs, iodipin 10 per cent., per 

 os, one to three teaspoonfuls per day, administered in 

 milk, or mixed with gum acacia and treacle and given as an 

 electuary. 



POTASSIUM IODIDE. Potassii lodidum. Potassic Iodide. KI. 



The iodide is prepared by slowly adding iodine to a solu- 

 tion of potash, until it acquires a brown colour, evaporating 

 to dryness, mixing the residue with one- tenth of its weight 

 of powdered charcoal, and fusing in a red-hot crucible. The 

 fused mass is dissolved in hot water, filtered and evaporated 

 until a film appears on the surface, when it is set aside to 

 crystallise. 



PROPERTIES. Cubical crystals, colourless, generally 

 opaque, with a faint odour of iodide, a saline taste, decrepit- 

 ating when heated, fusing at a red-heat, at a higher tempera- 

 ture volatilising unchanged, soluble in two-thirds of its 

 weight of cold water, in twelve parts of rectified spirit, and 

 in three parts of glycerin. These agents dissolve iodine 

 freely, and are hence useful vehicles for its exhibition. 



