298 
DR. KANE ON THE CHEMICAL HISTORY 
the salt were not uniformly acted on by the heat, but the relation of the total volume 
of nitrogen to the total volume of carbonic acid was very exactly 1 : 4. 
These results show that the formula of this salt is Pd . O . C 2 0 3 + N H 4 O . C 2 0 3 
+ 2 Aq, giving 
Theory. 
Experiment. 
Pd = 53*3 
30*06 
30*20 
2 . C 2 O, = 88*0 
49*64 1 
58*23 
NH 4 = 18*0 
10*15 J 
2 . Aq = 18*0 
10*15 
11*57 
177-3 
100*00 
100*00 
The salt crystallizing in long needles, gives, when dried, about 7 0 per cent, of dried 
salt, having lost 30 per cent, of water. By ignition it yields from 23 to 23*26 of 
metallic palladium. These numbers point out that it contains eight atoms of water 
of crystallization, from which the numbers should be 31T3 of water, and 23*04 of 
metal. 
Section II. — Platinum Compounds. 
Protoxy chloride of Platinum. 
During experiments conducted for the purpose of preparing sulphate of the deut- 
oxide of platinum, and the results of which I shall on another occasion more spe- 
cially describe, I had occasion to remark the formation of the substance now in 
question, and to determine its properties and composition. The bichloride of plati- 
num being boiled with strong sulphuric acid in a retort, nearly to dryness, much 
muriatic acid gas is driven off, and on washing out the residue with water, a black 
powder remains undissolved, which may be collected on a filter. It is anhydrous. 
At a red heat it evolves oxygen and chlorine, leaving metallic platinum. In solution 
of potash it appears to dissolve. By ammonia it is converted into a fulminating 
substance, of which the analysis is not yet completed. By muriatic acid it is con- 
verted into the ordinary protochloride of platinum. 
Its analysis was effected as follows : — 
29*402 grains were perfectly fused with an excess of carbonate of soda. When the 
saline matter was dissolved out with water, metallic platinum remained which weighed 
25*620 grains, or 87*14 per cent. The solution having been precipitated by nitrate 
of silver, after being acidulated by nitric acid, gave 8*995 of chloride of silver, or 
30*55 per cent., containing 7'54 of chlorine. 
These results lead to the formula Pt Cl + 3 Pt O, which gives 
Theory. Experiment. 
Pt 4 = 395*2 86*94 87’14 
Cl = 35*4 778 7’54 
0 3 = 24*0 5*28 5*32 
454*6 
100*00 
100*00 
