428 
DR. JOHN STENHOUSE ON THE ACTION OF 
The preceding determinations of the platinum were made with the salt prepared at 
several different times. 
I. 0*4879 grm. salt gave 0*475 carbonic acid and 0*217 water. 
II. 0*3573 grm. salt gave 0*345 carbonic acid and 0*1528 water. 
0*8531 grm. salt gave 1*06 Cl Ag=0*2621 Cl=30*72 per cent, chlorine. 
13 C 
Calculated numbers. 
1125*00 
26*38 
I. 
26*55 
11 . 
26*33 
16 H 
200*00 
4*68 
4*99 
4*74 
N 
175*20 
4*10 
2 0 
200*00 
4*73 
Pt 
1233*50 
28*93 
28*76 
28*76 
3 Cl 
1329*60 
31*18 
30*72 
30*72 
4263*30 
100*00 
The double chloride of sparteine and platinum, when dried in vacuo, has therefore 
the following formula, 
C,, H ,3 N, Cl H+Pt CI 2 + 2 HO. 
As it was plain from the result of these analyses that the double chloride of platinum 
and sparteine, when dried in vacuo, contained 2 equivs. of water, it was transferred 
to the water-bath and heated to 212° Fahr. ; and as it continued to give off its water 
very slowly, it was exposed for twelve hours to a temperature of 266° Fahr., when it 
lost 5*54 per cent, water. The salt then ceased to lose any additional weight, and 
was not decomposed, though the heat was raised to 300° Fahr. 
1*892 grm. salt lost 266° Fahr., 0*105 grm. =5*54 per cent, water; the calculated 
quantity for 2 equivs. of water is 5*57 per cent. 
Double Chloride of Mercury and Sparteine. 
When a solution of hydrochlorate of sparteine was added to a tolerably concen- 
trated solution of corrosive sublimate, a white crystalline precipitate was immediately 
produced. This was collected on a filter, washed, and then dissolved in dilute 
hydrochloric acid. On the cooling of the solution, the double chloride crystallized 
in right rhombic prisms of considerable size and very high lustre. Through the 
kindness of Professor W. H. Miller of Cambridge, to whom I have been often 
indebted for similar obligations, I am enabled to subjoin an exact figure of these 
crystals, together with the measurements of their angles. 
