154 PREPARATION AND EMPLOYMENT OF HYDRIODIC ETHER. 
the sulphate of copper ; the best means of being certain of which, 
is to hold a bright spatula in the boiling solution a few minutes, 
when if any copper remains the spatula will be covered with a 
film. The solution is now decanted from the excess of iron-filings 
and evaporated to 33° Baume. Whilst yet boiling, six parts of 
bitartrate of potass a in powder are added, and after a few minutes 
the vessel is removed from the fire, and the solution slightly acidu- 
lated with sulphuric acid. The solution is filtered into bottles, 
and then poured into plates, previously rinsed with a little diluted 
sulphuric acid, that it may crystallize. In three or four days the 
solution is decanted from the crystals, which are drained and dried 
spontaneously. 
ON THE THERAPEUTICAL APPLICATION, AND ON THE PRE PA 
RATION OF HYDRIODIC ETHER. 
In the Journal de Pharmacie for October, 1850, an account is 
given of the employment of hydriodic ether as a remedy, by way 
of inhalation by Dr. Huette. Fifteen to thirty grains of the hy- 
driodic ether is transferred, by means of a graduated pipette, into 
a little ground stoppered bottle, (3 or 4 centimetres) an inch to an 
inch and a half high. The ether is covered with a stratum of 
water about 2 or 2| millimetres thick, the object of which is to 
moderate the evaporation; when the vial is applied to one of the 
nostrils, and the air contained within it is drawn by an inspiration. 
The ethereal vapor is sufficiently diluted with air before reach- 
ing the lungs. The evaporation of the ether may be accelerated by 
inclining the vial to one side, so that the continuity of the watery 
layer may be broken; and the heat of the hand may be applied to 
the same object. Fifteen or twenty inspirations suffice for the im- 
pregnation of the system with iodine, and a quarter of an hour 
after the cessation of the inhalations, iodine is found in the urine. 
Nevertheless Dr. Huette has ascertained it to be present fifty or 
sixty hours afterwards. 
Dr. Huette thus describes the physiological effects of this ether. 
" After some inhalations," says he, ' c an impression of calmness and 
