262 
ON THREE KINDS OF QUININE. 
The property which hydrated ether possesses of rendering the 
oil of turpentine opake, may be applied to determine the hygroma 
trie water in salts. It suffices to leave them in contact for a few 
minutes with anhydrous ether, and then ascertain whether it ren- 
ders turpentine turbid. This mode of operating cannot be adopted 
in the case of substances insoluble in the turpentine which dissolve 
in the ether, or of salts which are dehydrated by the latter liquid, 
for instance, very efflorescent salts, such as the crystallized phos- 
phate, carbonate and sulphate of soda. The process may be ap- 
plied for detecting the presence of interstitial water in the slightly 
efflorescent crystalline salts, as the sulphate of copper and the sul- 
phate of manganese, and those which are unaltered by exposure to 
the air, as the chloride of barium, the oxalate of ammonia, &c. 
Ether is preferable to alcohol in these experiments, because a 
smaller proportion of water can be discovered in it ; and, moreover, 
the latter liquid dissolves, and dehydrates a larger number of salts 
than ether. 
Taking advantage of the insolubility of water in benzine, I have 
been able to preserve intact, crystals of deliquescent salts, as those 
of the chloride of calcium and bichloride of copper ; efflorescent 
salts, as the phosphate, sulphate and carbonate of soda J and lastly, 
crystals of salts which become oxidized in the air in the course of 
time, as the protosulphate of iron. To preserve these substances 
in benzine, it is only requisite that they should have been well 
dried on blotting paper, or wiped with a piece of fine linen. Crys- 
tals which had been kept in benzine lost all smell after they had 
been submitted for a short time to a somewhat bripk current of air, 
and had experienced no alteration in their composition or proper- 
ties. — London Chem. Gaz., Feb. 16, 1852, from Comptes Ren- 
dus, Dec. 22, 1851. 
ON THREE KINDS OF QUININE. 
By J. Van Heijnistgen. 
If common pure quinine be dissolved in absolute alcohol and the 
latter allowed to evaporate spontaneously, a resinous mass remains 
behind, in which acicular crystals are contained. If it be dissolved 
