PHARMACY AT TIIE DUBLIN EXHIBITION. 
147 
Prussic acid antidote. —Take of liquor of perckloride of iron 37 minims, 
protosulpliate of iron in crystals, as pure as possible, 25 grs.; as muck water 
as make a solution of a protosesquisalt of iron, measuring about half an 
ounce. Dissolve, on the other hand, 77 grs. crystallized carbonate of soda 
in about half an ounce of water. These quantities destroy the poisonous 
action of between 100 and 200 minims of medicinal prussic acid, officinal 
strength, on giving first the one liquid and then the other. 
Antidote for cyanide of 'potassium. —The antidote for this compound is the 
same as for prussic acid, except that the solution of protosesquisalt of iron is 
to be used without the alkaline solution, the prussic acid being already com¬ 
bined with an alkali; the use of the alkali, however, would not be injurious ; 
a harmless yellow prussiate would be formed. In this case, in consequence 
of the possible presence of free acid in the stomach, the alkaline liquid should 
be given first,—the quantities given, as the prussic acid antidote would de¬ 
compose 35 grains of cyanide of potassium. 
Antidote for arsenious acid. —Measure out 5 fluid drachms and 7 minims 
of liquor ferri perchloridi into 2 or 3 oz. of water, then add to the liquid a 
solution of 1 oz. of crystallized carbonateof soda in a few ounces of warm 
water, stir till effervescence ceases ; the resulting mixture destroys about 10 
grs. of arsenious acid. 
Antidote for tartar emetic. —Mix 5 fluid drachms and 7 minims of 
liquor ferri perchloridi with a few ounces of water; mix in now a cream 
formed of 90 grs. of calcined magnesia, rubbed up with water in a mortar, 
stir till, after gelatinizing, the mixture again gets thin; empty the mixture 
into a calico or muslin cloth, and press out the liquid; remove the mass from 
the cloth into a clean mortar, and rub it up with a little water into a smooth 
cream; in this state it can destroy upwards of 20 grs. of tartar emetic. It 
may also be used as an antidote for arsenious acid, of which it absorbs about 
10 grs. 
An important addition to this paper will appear in the next Journal. 
PHABMACY AT THE DUBLIN EXHIBITION. 
BY HARRY NAPIER DRAPER. 
(Continued from p. 107.) 
Colonial Possessions. —The general collection from the Bahamas, which 
consists principally of indigenous woods, including a few things of pharma¬ 
ceutical interest, as Cascarilla Baric, Wild Cinnamon, and Ambergris. 
Myrtle Wax from the berries of Myrica cerifera is also shown; this wax 
is remarkable for its green colour, which would appear to be due to the pre¬ 
sence of chlorophyll’. The Myrica cerifera is said by Bichard to be abun¬ 
dant in the United States. The berries are covered with a waxy coating of 
shining whiteness, and on being boiled with water, yield about one-fourth of 
their weight of the wax. The green colouring matter is removed by ether. 
The authority already quoted, observes that the Myrica thrives well in the 
climate of Paris, and that the extension of its culture would be very desirable. 
Canada sends maple sugar, a few gums of no great interest, fine specimens 
of plumbago and other useful minerals, among which the most notable is 
Apatite, said to contain 90 per cent, of phosphate of lime, and which is of 
course very valuable as a source of phosphoric acid for manure. 
The collection from the Palkland Islands includes specimens of Penguin 
Oil, both crude and refined. This is, I suppose, used by curriers, as its very 
repulsive taste and fishy smell would quite unfit it for burning or for being 
a substitute for cod-liver oil, which it somewhat resembles in general character. 
