803 
IODURETS OF MERCURY. 
a quantity, the effects produced by the ointment resemble, in some 
degree, those of a mild blister. It is a good plan to use the strong 
preparation first, and then follow up the treatment by frequently 
applying the milder one afterwards. The latter is excellent as a 
stimulant for indolent ulcers, and in such cases a few drops of oil of 
bergami may be added. Internally administered, the iodurets of 
mercury seem to have a powerful effect in changing the action of 
the system when affected by an animal virus — that of rabies canina, 
stings, and venomous bites excepted. They have been found 
eminently serviceable in syphilis; and, to my own knowledge, 
have eradicated the baneful effects resulting from inoculation of 
the human subject with the matter of farcy and glanders. Their 
internal exhibition to our domestic mammalia in a state of health, 
and when affected by different diseases, will be discussed at some 
future, and no very distant, period. 
The following is the mode of obtaining 
Ioduret of Mercury. 
R Crystallized proto-nitrate of mercury, one hundred parts, 
Water, four hundred parts. 
Dissolve, filter, and add ioduret of potassium dissolved in water 
that has been acidulated with nitric acid, until a precipitate ceases 
to be formed. Collect this on a filter; wash it with distilled water 
until a black precipitate ceases to be produced by the addition of 
potass to the water ; then dry and preserve it in a well-stoppered 
bottle, keeping it from the light. 
Deuto-Ioduret of Mercury. 
R Deuto-chloruret of mercury, seventy parts 
Ioduret of potassium, one hundred parts. 
Add as much distilled water to each as will cause its solution ; 
filter the two liquors, and then let them be slowly mixed together. 
Collect the precipitate on a filter, then wash it with distilled water 
until this comes off tasteless; after which dry and pulverize it. 
This being done, keep it in a dry place, preserving it from the light 
and air. — Or, 
R Solution of hydriodate of potass, in any quantity 
add to it, drop by drop, 
Solution of deuto- chloride of mercury, 
until it ceases to add to the precipitate; which wash, dry, put into 
an air-tight bottle, and keep from the action of light. 
