236 SCIENTIFIC NEWS* 



Chenevix on the He obtained the alkaline falts pure by repeated cryftallifations, 

 ftates of the 

 muriatic acid. 



and the earthy falts by boiling them with phofphate of filver 



He has examined likewife feveral of the metallic falts of 

 this genus, and mentions hyperoxigenifed muriate of filver, 

 as ftrongly marking the difference between muriatic and hyper- 

 oxigenifed muriatic acid. He afcribes to this fait, when 

 mixed with combuftible bodies, an expanfive force, which he 

 thinks he will be much within bounds, if he ftates to exceed 

 five times that of any known detonating fait. 



He concludes with an appeal to the chemical world, whe» 

 ther, in the prefent ftate of the fcience, it would not be more 

 philofophical to fay, 

 Muriatic radical, or") 



fome one word j Muriatic acid. 



analogous to it, j 



Muriatous acid, > InReid of < 



Muriatic acid, 



Oxigenifed muriatic 



acid. 

 Hyperoxigenifed mu- 

 riatic acid. 



and ftates the arguments in favour of either mode of appella- 

 tion. 



As a warning to thofe who would repeat his experiments 

 he relates, in the courfe of his paper, an accident that hap- 

 pened in his laboratory to himfelf and to Mr. Vandier, by 

 which the latter gentleman had almoft loft his light, and 

 was wounded in the moft dreadful manner. 



A new Method of obtaining the Gallic Acid pure. By M. 

 Fiedler, Student in Plutrniacy *. 



As alumine has a great affinity with many vegetable fub- 



ftances, I inferred that this property might be applied to dif- 



engage the gallic acid from the extractive and the tanin which 



always adhere to it ; and by that means to obtain the acid pure 



and eafily cryltallizable. 



Solution of alum kxpemmcni 1. — I dhTolvcd two ounces of alum in boiling 



precipitated by water ; I filtrated and precipitated it by a folution of potato \ 



p0 ' I feparated the precipitate, and edulcorated it till the water 



of the lixiviation no longer rendered the muriate of barytes 



turbid. 



* Journal de Chimie, par Van Mons. I. 85. 



Experiment 



