44 
SELECTED ARTICLES. 
In general, in all the operations where the acids remain 
adherent to the stuff it is necessary to remove them, either by 
free washing, or alkaline solutions. 
Journal de Chemie Medicale. 
ART. VII—ANALYSIS OF TARTAR EMETIC. 
By xMr. Richardson. 
Mr. Phillips' analysis of this salt, differing from Dr. 
Thompson's in the proportion of water which it contains, 
Mr. Richardson repeated the experiments of the latter, em- 
ploying the same specimen. The analysis was conducted in 
the following manner: 25 grains were heated for a considera- 
ble time on the sand bath, at a temperature of about 400° F., 
and lost 1.21 grains or 4.84 per cent. The residuum was 
dissolved in water, and the antimony precipitated by sulphu- 
retted hydrogen. The precipitate, after being washed and 
dried, weighed 13.3 grains. But 11 sesquesulphuret of anti- 
mony : 8 antimony : : 13.3 : 9.67 grains = 1 1.48 grains oxide 
of antimony. The liquid and washings from the above preci- 
pitate were carefully evaporated to dryness and the residual 
salt weighed 13.23 grains. From the composition of bitar- 
trate of potassa, it follows that the result is. 
Oxide of antimony, 45.92 atoms. 
Potassa, 12.80 
Tartaric acid, 35.25 
Water, 4.84 
These being resolved into atoms, give the following consti- 
tution: 
Oxide of antimony, 4.83 2.26 atoms. 
Potassa, 2.13 1.00 
Tartaric acid, 4.27 2.00 
Water, 4.30 2.01 
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