of the Metals of the Magnesium Group. 241 
Cad 
ble quantity of water, oxalic acid added in excess, and then a 
that SH, gave in the filtrate a scarcely perceptible yellowish 
tinge. The oxalate was washed with alcohol by Bunsen’s 
method and dried at 110° C., until every trace of aleohol was 
expelled. The filter was then pierced with a glass rod, and 
the cadmic oxalate washed into a flask with hot diluted sul- 
pr. ct., 44°65 pr. ct., 44°88 pr. ct., and 44°27 pr. ct. of cadmium, 
as computed from the oxalic acid. These results are all much 
too high, and show that the acid had acted sensibly upon the 
ter. Two other experiments were then made. In the first 
a hot solution of ammonic sulphate was used as a solvent for 
the oxalate; in the second hot dilute chlorhydric acid was em- 
ploye the hypermanganic solution employed 100 c¢. c. 
contained 01108 gr. of available oxygen. 
I. 04330 gr. cadmic AP aig required 24°5 c.c. hypermanganate 
‘ et. C 
= rT. 
Ul. 0°3724 gr. canis sulphate required 21-1 ¢.c. hypermanganate 
= 43°74 pr. ct Cd. 
The received formula 3CdSO ,+8H, O requires 43°75 pr. ct. In 
these two analyses the filters were not broken. - 
-Barium.—Barie chlorid gave extremely variable results in 
my first experiment, notwithstanding the fact that the barium 
is completely precipitated by oxalic acid and alcohol. The 
resulting oxalate, after washing and drying, was not completely 
decomposed by sulphuric acid, which appeared to form a crust 
of baric sulphate upon the crystals of the oxalate. This diffi- 
culty was finally overcome by dissolving the baric oxalate in 
chlorhydric acid and diluting the solution largely. In this 
manner: 
0°6505 gr. barie chlorid required 80 ¢c.c. hypermanganate = 56°21 
pr. ct. Ba (100 c.c. hypermanganate solution contained 0°053 
gr. available reef The formula Ba Cl, + 2H,0, requires 
56°15 pr. ct. Ba. 
Strontivm.—To avoid the use of paper filters so as to be 
able to employ sulphuric acid as a solvent, I resorted to sand 
filters. «A tht funnel was ground truly cdnical near the throat. 
A little pear of glass with a long stem was then dropped into 
