ria 
Chemistry and Physics. 263 
Chloric acid is to be prepared by adding to chlorate of baryta just 
enough sulphuric acid to combine in the baryta—a co time is requir- 
ed to complete the decomposition—afier this filter and evaporate, 
If the acid is added as long as a precipitate falls, an excess will be 
found in the liquid. . 
or pyrotechnical use the chlorates may be prepared without the use 
ol. s 
of aleoh 
10. On the Hydrates of Nitric Acid; by Antuur Smita, (Phil. 
Mag., December, 1847.)—With a view to deiermine the composition of 
these hydrates especially the first hydrate about which some doubt has ex- 
sted, the author commenced his experiments upon a quantity of pure 
So 
ed liquid, the strongest pure colored acid obtained was found to have 
almost exactly the composition lts boiling point was 184°, 
even when boiled. No change took place in it on exposure to a freez- 
ing mixture of ice and salt. . 
An attempt was made to form a deutohydrate by adding water in 
proportions to acid of known strength, but on distillation the 
e no effect. _ 
The letrohydrate NO, H+3HO was formed by adding so Ste 
the 
2 
builing point uniformly, 2 very weak acid boiled for several 
ours was brought nearly to this hydrate. Stronger acids are also 
brought to the same strength by boiling, as they lose acid his 
11. On the action of Anhydrous Phosphoric Acid upon the Amides 
and Ammoniacal Salis; by MM. Demas, Matacutr and Lestanc, 
(Chem, Gaz., Nov. 1, 15, and Dec. 1, from Compt. Rendus de |’Acad., 
Sept, 13, 27, and Oct. 4, 1847.)—By acting with anhydrous phospho- 
Ne acid upon crystallized acetate of ammonia, M. Dumas obtained a 
Volatile liquid which boiled at 171° and was miscible with water in all 
Proportions. When purified by rectification over chlorid of calcium, it 
84ve on analysis the following numbers: 
arbon, ; . 574 . . . ae oo 
Hydrogen, . . TAhvie soe , 1 = 342 
Phoinethol ), and when carefully purified was found to be perfectly iden- 
Ucal in all its characters with the substance from acetate of ammonia. 
