56 
ON PERCHROMIC ACID. 
The decomposition of the perchromic acid in the muriatic 
liquid is 
Cr^ 07 +3HCi = Cr^ Cl3,3HO + 0\ 
It was attempted to confirm this reaction by the isolation of 
the perchromic acid ; but all experiments to combine the 
blue body with an inorganic base failed, and after the ex- 
periment was concluded a chromate was constantly found 
in the liquid. Ether, on the contrary, by being agitated 
with the aqueous liquid, immediately took up the blue body, 
the water became colourless, and the supernatant sether 
blue. But as soon as the esther was removed and evapo- 
rated, the water dissolved in it was found to contain chro- 
mic acid, as in the preceding experiments, and not oxide of 
chromium. The author succeeded in combining perchromic 
acid with vegetable bases. Quinine and strychnine dis- 
solved in aether were precipitated of a dirty violet by the 
perchromic acid, extracted with aether from the aqueous 
solution ; but the stability of these salts was very slight, 
and they could only be kept a few hours after their prepa- 
ration. 
Some experiments to procure higher oxides of other me- 
talHc acids led, in the case of vanadic acid, to the following 
result : On treating the vanadiate of ammonia in the same 
manner as the chromate of potash in the preceding experi- 
ments, the liquid assumed a blood-red colour, which was 
more constant ; but from the small quantity of material at 
the author's disposal, the compound could not be further 
examined. — Chem, Gaz.^from Jinn.de Chim.et de Phys. 
