266 Scientific Intelligence. 
sulphydrate of ammonia. It has a fine yellow color but is inferior in 
lustre to the alloy of 95 copper to 5 of aluminum. An alloy of 97 parts 
of aluminum and 3 of silver has a very beautiful color, and is not acted 
on Wy yar hydrogen. — Comptes Rendus, xliii, 925, ov. 10, 1856. 
nace the matter fuses and gives at the bo ttom of the cmelble a viscid 
glass above which an [purge fluid liquid i is found which may be poured 
off while the crucible is hot. If the crucible be allowed to cool, two “solid 
asses are formed, which are easily séparated. The upper mass is crys- 
talline and white or slightly rose colored from the presence of manganese. 
This mass is a combination of the sulphates of baryta, potash, and lithia; 
by simple washing the alkaline sulphates may be separated from the sul- 
phates of baryta. The same process succeeds with petalite if we add to 
it such a quantity of sulphate of potash as will make the total quantity 
of alkali about the same as in lepidolite. By adding more potash to lepi- 
dolite itself, the author succeeded in separating still more of the lithia, 
about 3 per cent. Sulphate and carbonate of lime seat be used i in a 
of ng salts of rg eg: s Rendus, xliii, 921 
GI. 
HsAgOs—C4H102 , 2CaHsOs-42 Agl. The acetate is a limpid 
liquid, neutr ral dna without Gllar It boils at 185° C., and is heavier than 
water. The acetate has the Senile CaH4O02 | Cals ae the base being 
biacid. When the a soci is digested with 2 equivalents of fused caustic 
potash for several hours in an oil-bath at'180° and then distilled at 250°, 
the glycol passes over as _a colorless liquid, which boils at 195° and dis- 
tills unchanged. Glycol isa limpid oily liquid which has a sweetish taste, 
and is soluble in all proportions, in water and alcohol. Its peri! is 
CaHe6Oa, and it therefore differs from alcohol in containing 2 eqs. 
of o els The author considers it as a true biatomic alcohol, so ‘that 
we have 
CszH604 biatomic, 
Glycerin CeHsO6 triatomic. 
While alcohol ag one equivalent of water in forming cme of ethyl, 
ve loses two in forming its corresponding diacetate, an rin three 
rey as its je Tn this way is shown, as the hes sot, 
first time in ic chemistry, the rinciple of i SR OREADS chemistry, 
that fe anueg at equivalents of "an aci et whi aca 
Alcohol CaHeO2 uniatomic, 
Glycol 
tween the ethers and the fats. Droui.ce Ate CeHeBra, as upon 
acetate of silver and yields the acetate of af pps ¢ CsHs02, 2 2CsH30s, 
