Translations and abstracts from the French. 259 
It dissolves in both nitric and sulphuric acid, sont heat, but 
undergoes no change of properties even if those acids are 
boiled down upon it. Neither nitrous nor sulphurous acid 
gases are disengaged, and the cyanic acid remains without 
the least race perfectly crystallized, in plates of the 
purest whiteness. ‘These are remarkable evidences of its 
stabilit 
With potassium it combines, forming potash and a cyanu- 
ret of potassium, ie oe a blue color with the sul- 
phate of iron and an 
It unites with base gor oducing salts, some of which are 
perfectly shetatachell wh er crystalline forms, and by in 
teresting chemical proper 
It appears to have no decided effect on the animal econ- 
patie acid is obtained, by submitting to slight ebullition, 
perchloride of cyanogen in much water. As a portion goes 
off with the vapor of the water, before it is converted into 
hydro-chloric and fe acids, it is best to use at first a bal- 
chloric. "Tt t isto be washed on a ites with’ a little cold 
water to remove the last sicirtisie of the hydro-chloric acid, 
til the washings give only a slight precipitate with nitrate of 
he soluble in nitric acid, and insoluble in ammonia, not | 
n excess, which, on the contrary increases the precipitate. 
it must be fedissolved 3 in hot water, filtered and evaporated 
to a certain point, and on cooling the cyanic acid separates 
in small rhomboidal crystals, transparent and very pure. 
The analysis of this substance has rigorously confirmed 
the composition presumed from that of the perchloride of 
cyanogen, — gives rise to it. 
It is forme 
Srunogie: 2 eee Se 0.61897 atom, 
Oxigen, - - - - 0.3811 =2 atoms. 
35 
