ARS=ARS ' 61 
be very prejudicial ;” while Dr. Paris believes, that the 
fact that arsenious acid is really decomposed when brought 
in heated contact with an-oxidable metal, is reason suffi- 
cient to explain why the fumes of the alloy in question are 
disarmed of their virulence. (Pharma.) Arsenic possesses 
many of the habitudes of an acid—it combines with pure 
alkalies to saturation, and hence is now denomi- 
nated arsenious acid. It may be further acidified by bei 
distilled with nitrous acid, and the compound which is the 
result is a white concrete, termed arsenic acid. é 
ires 400 parts of water at 60°, and only 13 parts at 
D132 ; and that if was sey of water be belied on it, and 
suffered to cool, the fluid will hold. three grains in so- 
lution, and deposite the remainder in tetrahedral crystals 
—hence the necessity of using boiling water, in every 
chemical examination of substances supposed to contain 
arsenic. ‘This substance is soluble in alcohol-and oils, the 
former taking up 2 percent. With lime-water, it produces 
a white precipitate of arsenite of lime, which is soluble in 
an excess of arsenious acid. With magnesia, it forms a 
very virulent soluble arsenite. (Paris.) On the simple 
watery solution of the oxyde, no change is produced by 
a solution of copperas, corrosive sublimate, tartar emetic, 
the mineral acids, or the alkalies. Nitrate of silver throws 
down a yellowish precipitate, which gradually passes to a 
brown colour; a white precipitate is produced by the 
super-acetate of lead. Lime-water precipitates it white ; 
ts of the se as yellow; and sulphuretted 
hy ren gas, a golden colour. Se 
Sophisticated with chalk, gypsum, and sulphate of ; 
detected by not being volatilized by heat, or an insoluble 
residuum being found in preparing Fowler’s solution, 
Antidote. After all the attempts at discovering one, it appears 
there is none. The sulphuret of potass, the last lauded 
antidote, has failed. The best and only antidote is to get 
“it out of the stomach, if we can, by every means to be 
pointed out in the section (F) of these lectures. If we 
cannot do that, why, even so, it is no di e to be foiled 
by arsenic/—but it is one to dilly-dally with fallacious 
chemical supposed antidotes—while arsenic is more engaged 
in its own proper business, when it unluckily gets into the 
stomach, than we may be with ours, when, called to fight it, 
F 2 
