el 
Barium, ajar Calcium fet Magnesium 177 
"ile ere intensity is the same as degree of solubility. In other 
words, the solubilities of the above salts are in the order of their 
“atomic weights. 
truth of the general er will be apparent from 
seclidecing the following fac 
I. Barium unites with two aie of oxygen, and is stable in 
this state of combination at ordinary temperatures. 
Strontium and calcium peroxyds are only known in combina- 
tion with water. 
Magnesium combined with two atoms of oxygen is unknown. 
II. Barium, gt or em and calcium all oxydate at ordinary tem- 
peratures in the air. 
Magnesium deus not. 
III. Barium thrown into water causes decomposition with a 
stormy evolution of hydrogen gas 
Strontium and calcium are both dissolved with escape of hy- 
rogen. 
Magnesium may be washed in water that has been money 
freed from air by boiling, without diminution of its lus 
- Baryta moistened with water enters into “a with 
rane attended by such evolution of heat as melts the hydrate 
a falls with water to a white pulverulent hydrate, with 
the production of intense heat. Lime similarly treated yields a 
heat that will fire sulphur.$ 
Magnesia in uniting with water is but slightly heated. || 
— Hydrate of baryta loses none of its water under intense 
re t.7 
5 Fines, of strontia, by long continued red heat, melts, and by 
higher heat loses all its water. 
Hydrate of lime, by moderate red heat without meing, leas 
its water 
iieste of magnesia loses its water below the red heat. 
VI. Carbonate of baryta, an hour and a half exposed to the 
_ Most effective blast furnace heat, loses its carbonic aci 
Carbonate of strontia, loses its carbonic acid in the strong heat 
of an open fire. 
Carbonate of lime is decomposed at a 
gue of magnesia loses its priors rite at a moderate 
hea’ 
_ VIL felanise of baryta and selenite of strontia are insoluble 
In water. 
enard. Ann. Chem. Phys,, viii, 308. Rammelsberg, Pogg., xliv, 558. 
+ Thenard. Ann. Chem. Phys viii, 313. + Dobereiner. Schw., vi, 367. 
3 Ann. Chem. Phys., xxiii, | H. Davy. 
qi Bucholz u. Gehlen, te 258, eee 
enham Smit! ix, OES, SEs; 
tt Abich, Poge tktiog 814 — rc Ibid a 4 
Szconp Szrres, Vol, IX, No. 26,—March, 1850. 
as 
