NATURE OE DEPOSIT IN REINSCH’s TEST FOR ARSENIC. 29 
matter as the stalks and leaves, and it has been stated, on 
the authority of a French veterinary surgeon, that exhausted 
and worn-out horses are very speedily restored to strength 
and condition by giving them daily one or two bundles of 
couch-grass, of ten or twelve pounds’ weight each, mixed with 
carrots. 
NEW SALT OE IRON AND QUININE. 
The following compound has been advocated as a tonic by 
Dr. Fergus : 
Sulphate of magnesia * . . . .80 parts. 
„ of iron . . . . : . 15 „ 
„ of quinine.5 „ 
In a solid state it remains unaltered, while it forms a per-^ 
fectly clear solution, in which more quinine may be dissolved* 
if desirable* 
ROOT OE BLACK HELLEBORE. 
It was stated by Mr. Hanbury, at a late meeting of the 
Pharmaceutical Society, that he believed there are none of the 
roots of black hellebore to be found in the market. Of 
four samples he had bought, two were actea , and the others 
neither actea nor hellebore. 
Mr. Squire said whenever he wanted black hellebore root, 
he dug up a Christmas rose, and Professor Bentiy, in con¬ 
firmation, stated that all the so-called roots of black hellebore* 
were those of the actea rosea . 
NATURE OE THE DEPOSIT IN REINSCH’S TEST EOR ARSENIC. 
M. Lippert has ascertained that the deposit which takes 
place on the copper used in Reinsch’s test for arsenic does 
not consist of pure metallic arsenic, as once thought, but a 
mixture or alloy of copper and arsenic, containing 68 parts of 
the former to 32 of the latter. 
He says, u The great sensitiveness of the process, therefore, 
arises from the large proportion of copper united with the 
deposited arsenic; and once aware of this fact, we can resort 
to it without inconvenience from knowing that all the arsenic 
will not be volatilized under the influence of the hydrogen 
current, as half, at least, will remain in the deposit.” 
