278 
DR. KANE ON THE CHEMICAL HISTORY 
The analysis D alone gives a result much more closely approximating to theory 
by it there is 
Pd 2 O 79-43, or 93 03 
O 5-95, or 6-97 
85-38 
100-00 
As there were many circumstances which led me to consider it unlikely that the 
15-42, the mean quantity of material expelled from the hydrated oxide by a moderate 
heat, could be entirely water, I determined the real quantity of water present in the 
following manner. The substance was placed in a tube of Bohemian glass, which at 
one end was put in connection with an apparatus evolving dry hydrogen gas, and at 
the other extremity was adapted to a tube containing recently fused chloride of cal- 
cium. When the apparatus had been completely filled with hydrogen, the tube con- 
taining the oxide of palladium was heated by means of charcoal. Water was evolved 
and the metal reduced. The current of gas was continued until all water had been 
carried into the chloride of calcium tube, and the weights were then determined. 
It was found that from 45 -687 grains of the hydrated oxide, there were obtained 
33*532 grains of metal, and 11*298 grains of water, giving 73*95 for the former, 
and 24*74 for the latter per cent., but of this 24*74, there were formed 12*49 by means 
of 1 T10 of oxygen which had been combined with the metal, and the water of hydra- 
tion amounted therefore to but 12-25 per cent. 
The difference between the total volatile matter and the water (3T 7 per cent.), 
may be certainly considered as carbonic acid, from the circumstances under which 
the substance is prepared, and from the fact that it in all cases effervesces slightly 
when dissolved in muriatic acid. 
We may sum up, therefore, the composition of this true basic carbonate of palla- 
dium as follows : — 
Last Experiment. 
Palladium . . 73*95 
Oxygen . . . 10-63 
Water .... 12-25 1 
Carbonic acid . 3-17-1 
Mean of A, B, C, D. 
72-60 
11-98 
1542 
100-00 100-00 
The formula deducible from these results is lO.PdO + C 0 2 + 10. H O, which gives 
the following numerical result: — 
Ten atoms of palladium . . . 
. 533 0 
73-52 
Ten atoms of oxygen . . 
80-0 
11-04 
Ten atoms of water .... 
900 
12-41 
One atom of carbonic acid . 
22-0 
3-03 
725 0 
100-00 
