Analytical Chemistry. 277 
exceedingly well purified as far as relates to its odor, being almost entirely 
free from the objectionable smell which characterizes most of the light 
oils, ¥. B.S. 
Boston, Aug. 20. 
ANALytIcaL CHEMISTRY.— 
5. Reinsch’s test for Arsenic not applicable to solutions containing 
Arsenic acid.—Werruer finds that the practice of applying Reinsch’s 
test immediately to the liquid obtained by the action of chlorate of 
potash and chlorhydric acid upon the substance suspected to contain 
arsenic must be discarded and that, as a general rule, the test is inappli- 
cable to liquids which contain arsenic acid. 
It had heretofore been supposed, and the belief is countenanced by so 
high an authority as Fresenius ( Andeitung zur qualitativen chem. Analyse, 
132, No. 7), that arsenic acid would readily be re- 
etallic copper unless a consid- 
erable quantity of arsenic acid be present. Similar negative results were 
ed from solutions which were allowed to stand upon the copper in 
fi 
s acid alone that the characteristic 
reaction of arsenic can be exhibited when dilute solutions of the latter 
cid. 
equivocal, lustrous, arsenical 
coating upon the copper could be obtained, on git for a few minutes, 
ia an 
rom which no arsenic could 
rent of hydrogen or of carbonic 
ya 
when this is cently heated. After having acted during a few hours the 
Solution ahitaios ‘iooaaeeeble quantities of arsemic acid but scarcely 
ce of arsenious acid. ia Re ata We : 
On the other hand common chlorhydric acid diluted with al 
Volume of water being boiled upon bright metallic arsenic oer ae ion 
of it, nor was any dissolved after digesting for two days at oe (C.) 
in a closed vessel.— Journal fur praktische Chemie, Ixxxii, 286. 
