508 REVIEW.— MANUAL OF VETERINARY PHARMACY. 
“Potassii Iodinum, Iodide of Potassium . 
“ Dissolved in water, this becomes an hydriodate of potassa. 
“ If a solution of potassa be poured upon iodine, there are pro- 
duced an iodate and an hydriodate of potassa, the latter of which 
may be separated from the former by means of rectified spirit, 
and the salt may be obtained pure by evaporation. This simple 
form of Majendie has given place to a more complex one, that of 
forming an hydriodate of iron, and decomposing it by carbonate 
of potassa. For this purpose, 124 grains of iodine and 50 or 
60 grains of iron (this in excess being an advantage) may be 
mixed with two or three ounces of oil in a Florence flask, and heat 
applied, by means of a lamp, until the liquid becomes clear. 
The solution of the hydriodate of iron being filtered, to it is 
added a solution of the carbonate of potassa, taking care that no 
more is added than is exactly necessary to decompose it : carbon- 
ate of iron is precipitated, and hydriodate of potassa remains in 
solution. When this is evaporated, and the compound obtained 
in crystals, it is an iodide of potassium.” 
Here follows a useful table of the decompositions. 
“ Mr. Youatt and Mr. Karkeek both speak highly of the 
iodate or hydriodate of potassium. The dose may be from 
twenty to thirty grains. 
“ It does not appear to accumulate in the system, like iodine, 
the kidnies being the emunctories by which it is ejected : it is 
easily detected in the urine, after it has been administed but for 
a short time. It is also more certain in its action. As a topical 
remedy, the form of ointment is preferred. 
“Unguentum Potassii Iodidi, Ointment of Iodide 
of Potassium . 
“Take of Iodide of Potassium .... 1 part 
Lard 8 parts. — Mix. 
“ The action of iodine and its compounds is most markedly 
seen in glandular structures and newly formed parts, for which 
they seem to manifest a preference. Their influence is on the 
absorbents, and through them, when these agents have been long 
and injudiciously given, it is recorded that even the mammae of 
women and the testes of men have been removed. In chronic 
enlargements of the submaxillary, parotid, mammillary, and other 
glands, in tumours of long standing, for thickening of the inte- 
guments, and indurated swellings about the joints, and even for 
unhealthy ulcerated surfaces, the use of the compounds of iodine 
is indicated, combining both their internal and external employ- 
