124 Scientific Intelligence. 
remarkable that the — salts of perchromic acid which could be formed 
were those with vegetable bases, quinine and strychnine, giving — 
violet precipitates of — slight stability. 
Vanadic acid se o be capable of similar transformatio 
[It is not ealiiehtna ne perchromic acid may be formed in otioaa ways. 
Some time before the researches of Mr. Barreswill, the writer of this 
attempted to obtain this body by the fusion of chlorate of potassa with 
uniformly appeared, but quickly vanished. At first it was thought that 
the presence of organic matter had produced a partial reduction, but 
this was found not to be the case. G. C. ScHaEFFER. 
13. Bromid of Carbon an Impurity of Commercial Bromine; by 
M. Poseteer, (Poggendorff’s Annalen.)—The distillation of commer- 
cial bromine gave a boiling point rising from 122° to 248°, the portion 
and aromatic ; taste sweet ; ae point 248°. ‘Nittie. and sulphurie 
acids produce: scarcely any dee mposition. Soluble in water sparingly, 
in alcohol and ether in every chitosan 
This impurity to the extent of 6 to 8 per cent. is probably formed b 
the ether used in the preparation of bromine. Bromine distilled wi 
ether gave little or none of it, unless chlorine had “ea y been 
through the mixture. A mixture of alcohol or pure alcohol. ene 
note “eae containing however much chlorine. 
14. On the Dehydration of Monohydrated Sulphuric Acids by M. 
Rises weit, (Comptes Rendus, July, 1847.)—This process had never 
been directly performed until M. Barreswill derived the following sim- 
ple method. Anhydrous phosphoric acid is mixed with strong com- 
mercial sulphuric acid and the mixture is gently heated. Distillation 
as with the Nordhausen acid, disengages wet osypbes acid, and 
the vitreous hydrate of phosphoric acid remains, It is remarkable 
the mixture does not affect organic matter, as paper nals pers which 
are instantly destroyed by the Nordhausen acid. 
This process, although theoretically interesting, can never be adopted 
as an economical mode of preparing anhydrous sulphuric acid. 
atl 
15. Solubility All Chlorid of Sodium in Alcohol; by R. Waensr, 
(Jour. f. Prakt. Chem., May, 1847. 
At 57° F. alcohol of 0-876 dissolves 0-661 pr. ct. of chlorid of sodium. 
59 « 66 or 6 0-700 « we Pt 
101 * 6s oe 6s 0-736 6 6s $B sso 
161 66 6s 66 “ 1-033 “ 6c 6 
59 * “ rw “ 0-174 “ 6 oe 
171 “ cc “se 0-171 6“ +6 BB gi 
G..c.8 
6. On Silica; by M. Dovert, (Comptes Rendus, July, 1847. Soe 
1. Excess of acid, particularly the birec Nene: if added drop by drop 
tothe ne silicates, throws down nearly all the silica; the same 
quantity added at once, does not precipitate the smallest portion. = 
