208 J. M. Ordway on Sesquisalts. 
with either MgS or 3Mg8;—Cr2Cls with 83KCl;—Fe2Cls with 
2KCl;—Rh2Cls with KCl, or with 2NH:Cl, or with 3NaCl;— 
AlaFs, Zr2Fs, and FeeFs with either 2KF or 8KF ;—rOxs 
with K Ox, or skOx, or 2NaOx; and #cOx, with 3kOx, or res > 
0: 
oxyds—that of uranium perhaps excepted—loses its solubility in 
Sia while thoria is described as 
ming passive by ignition, like most of the sesquioxyds. 
- When ammonia. is added to the sulphate, #5, the precipitate 
gontinues to redissolve till half the acid is neutralized. ‘The clear 
uid, it is true, at length becomes milky, and finally deposits a 
whitch sediment, but this is exposed hy cena in amount. The 
chlorhydrate, €cl H, acts in the same way. With the nitrate we 
may go much further before there is any permanent precipita 
In any solution, all the uranic oxyd cannot be thrown down 
an alkali, unless a sufficient cco is added to form an alka- 
ite. And whether the pure hydrates obtained a ee 
: are in the active state, so as to admit of the — 
s by direct combination, I have taken 20 
t sing that they would be. 
