284 
DR. KANE ON THE CHEMICAL HISTORY 
pelled to bring the liquor to the state suitable for the action of the caustic potash. 
This may also be effected by adding to the solution of the ammonia-chloride some 
solution of protochloride of palladium, so as to have in solution apparently a sub- 
stance containing Pd Cl + Pd Cl . N H 3 , which is not known in the solid form. 
The yellow precipitate which first falls is the ordinary crystalline body PdCl + NH 3 , 
but by boiling in the liquor from which it has separated, its nature is completely 
changed. The properties of the crystalline brown red substance then produced are, 
that it dissolves readily in muriatic acid, and gives by heat, sal-ammoniac, nitrogen 
and water, and leaves metallic palladium. Its composition was determined by ana- 
lysis to be as follows : — 
I. 14-601 grains having been ignited to perfect fusion with carbonate of soda, gave, 
when the saline material was dissolved in water, 8-0/2 grains of palladium, or 55*28 
per cent. 
The solution acidulated with nitric acid andprecipitatedbynitrate of silver, gavel 4’802 
grains of chloride of silver, equivalent to 101*4 per cent., containing 25‘03 of chlorine. 
II. 7'964 grains of substance gave, by the method pursued in similar instances, 
3*390 7 cubic inches of nitrogen, at standard temperature and pressure. These weigh 
1"080 grains, equal to 13*64 per cent. 
III. 9*231 grains of substance having been mixed with dry carbonate of soda, were 
introduced into a tube of Bohemian glass, and some pieces of platina foil being inter- 
posed, about four inches of the tube in front of the mixture were filled with oxide of 
copper. To this apparatus was adapted a tube containing recently fused chloride of 
calcium, and the whole being disposed and heated exactly as for an organic analysis, 
it yielded 3*212 grains of water, being 34*78 per cent., containing 3*85 of hydrogen. 
After this operation, the tube being cut by a file, that portion of it which contained 
the saline mass was digested with dilute nitric acid, and the metallic palladium col- 
lected on a filter. It weighed 5*170 grains, or 56*02 per cent. 
The solution treated in the usual way gave 9*337 of chloride of silver, or 101*2 per 
cent., containing 24*92 of chlorine. 
The summary of these results is 
I. II. III. 
Palladium .... 55*28 56*02 
Nitrogen 13*64 
Hydrogen .... 3*85 
Chlorine 25*03 24*92 
The deficiency in the sum of the preceding results being counted as oxygen, these 
numbers lead to the formula Pd 3 Cl 2 O N 3 H 9 , which gives 
3 . Pd = 159*9 55*20 
2 . Cl = 70*8 24*44 
O = 8*0 2*76 
9 . H = 9*0 3*10 
3 . N = 42*0 14*50 
289*7 
100*00 
