AND PHARMACOPCEIA. 497 



they soon will. Iodine is obtained from the mother-water, after 

 the procuration of carbonate of soda from kelp. Its action is that 

 of a stimulant to glandular structures, and the forms in which 

 it is employed externally are those of a liniment and ointment. 

 Internally it may be given in doses from five to ten grains twice 

 in the day, although there are objections to its being admi- 

 nistered uncombined, as iodine only enters the circulation in the 

 form of hydriodic acid, or an hydriodatc, and it is apt to accu- 

 mulate in the system. 



'* LiNiMENTUM loDiNii CoMrosiTUM. Compound liniment 

 of iodine. 



" Take of iodine 1 part. 



" Soap liniment 8 parts. — Dissolve. 



" Unguentum Iodinii. Ointment of iodine. 



" Take of iodine 1 part. 



"Lard 8 parts. — Mix. 



" Some substitute for lard the milder ointment of mercury, by 

 which a far more active compound is formed. Others add half 

 u part of cantharides in powder, or tartar emetic, by which ab- 

 sorption is promoted. Administered internally, the form of 

 tincture is advocated by many. If, however, it is long kept, it 

 is apt to undergo decomposition. 



" TiNCTURA Iodinii. Tincture of iodine. 



t( 



Take of iodine 1 part. 



"Rectified spirit 8 parts. — Dissolve. 



" The dose of this is from 1 to 2 dr. given twice a day." 



Iodide of Potassium is a preferable form of administering iodine 

 internally, as it is not liable to accumulate in the system like 

 iodine. It is a salt, containing 40 parts of potassium to 126 of 

 iodine. The dose for internal use is twenty to thirty grains in 

 the horse. It may be used in the form of an ointment with 

 eight parts of lard, or, being rubbed down with an equal portion 

 of quicksilver, with the addition of a little spirits of wine, the 

 lard may then be added, thus forming a compound ointment 

 very serviceable in promoting the absorption of glandular and 

 other swellings. 



Diniodhle of Copper. — Mr. Morton has formed a new com- 

 pound by the chemical union of iodide of jiotasslum and sul- 

 l)hate of copper, two ounces of the former and four of the latter, 

 with a pint and a half of boiling distilled water ; the copper to be 

 dissolved in two thirds, and the iodide in one third of the water. 

 When cold the solutions are mixed, and the precipitate falling 

 is to be separated and pulverised. 



