294 
DR. KANE ON THE CHEMICAL HISTORY 
the residual oxide, the 44*620 grains were ignited in a current of hydrogen gas, and 
the water so formed was collected in a chloride of calcium tube. It weighed 6*251 
grains, or 10*28 per cent., containing 9*14 of oxygen, and the remaining metallic pal- 
ladium weighed 38*927 grains, corresponding to 64*01 per cent. 
B. Basic nitrate produced by water. 
I. 29*665 grains of the brown precipitate, formed by diluting a strong solution of 
nitrate of palladium with a large quantity of water, gave, by very gentle ignition, a 
black residue of oxide weighing 21*747, or 73*31 per cent., and by vivid ignition 
18*939, or 64*36 per cent, of pure metallic palladium. 
II. 12*858 grains were mixed with copper filings, and more clean metallic copper 
being placed in front, the tube was heated in the same manner and with the same ar- 
rangement of apparatus as already described in A. The water collected in the chlo- 
ride of calcium tube weighed 1*420, corresponding to 11*20 per cent. 
III. 17'239 grains were mixed with copper turnings, and placed at the bottom of 
a tube of Bohemian glass, which was then filled with clean freshly-reduced metallic 
copper. The tube was about nine inches long. From it passed to the pneumatic 
trough a bent tube, of which the extremity opened, above the level of the water, 
under a narrow graduated jar, so adjusted as that it should rise as gas passed into it. 
The pure metallic copper having been first fully ignited, heat was applied to the ex- 
tremity of the tube, and the nitric acid of the salt was so completely deoxidized by 
the red-hot copper, that the gas which passed over contained no sensible trace of 
nitric oxide. When the operation was concluded the apparatus was allowed to cool, 
and the proper correction being made for the change of temperature which had 
taken place in the air of the room during the experiment, the volume of the gas col- 
lected in the graduated jar was considered to represent the quantity of nitrogen which 
the substance contained. After the proper corrections for temperature, pressure, and 
moisture, it measured 2*319 cubic inches, weighing 0*7452 grains, or 4*31 per cent. 
By this method the composition of the basic nitrate of palladium is found to be 
A. By Ammonia. B. By Water. 
I. II. III. 
Palladium 64*01 64*36 
Oxygen combined with metal 9*14 8*95 
Water 11*85 11*20 
Nitrogen 4*31 
These results lead to the simple formula N 
4 Pd = 
213*2 
63*61 
4 0 = 
32*0 
9*54 
N = 
14*0 
4*17 
o 5 = 
40*0 
1 1*94 
4 110 = 
36*0 
10*74 
0 5 + 4 Pd O + 4 
4 . Pd O = 245*2 
NO s = 54*0 
4 110= 36*0 
335*2 
H O, which 
73*15 
14*91 
11*94 
100*00 
gives 
335*2 
100*00 
