122 
DR. A. W. HOFMANN’S RESEARCHES REGARDING THE 
Percentage-composition. 
( 
I. 
II. 
> 
III. 
Carbon 
. 23*42 
Hydrogen .... 
5*22 
Platinum .... 
31*99 
32*10 
The formula 
C 12 H 
15N,HC1, PtCl2 
• 
requires the following values : — 
Theory. 
- -■ 
Experiment. 
12 equivs. of Carbon . . 
. . ‘ 72*00 
23*43 
23*42 
16 equivs. of Hydrogen . 
. . 16*00 
5*20 
5*22 
1 equiv. of Nitrogen . . 
. . 14*00 
4*54 
3 equivs. of Chlorine . . 
. . 106*50 
34*71 
1 equiv. of Platinum . . 
. . 98*68 
32*12 
32*04 
1 equiv. of Platinum-salt 
. . 307*18 
100*00 
These numbers are sufficient to establish beyond a doubt the formula 
rc.H 
as representing the compound in question. 
Although not inclined to expect a farther action of bromide of ethyl upon triethyl- 
amine, after the experiments performed with diethylaniline, but hoping to obtain 
in this series more definite results than the latter had yielded, I thought it important 
to appeal once more to experiment. A mixture of an aqueous solution of triethyl- 
amine and bromide of ethyl, sealed for this purpose into a tube, solidified after two 
hours’ ebullition. The crystals formed in this reaction had the fibrous aspect of the 
hydrobromate of triethylamine ; still among the transparent prisms some white opake 
granular crystals were observed. To gain more positive information, the excess of 
bromide of ethyl was volatilized and the residue distilled with potassa. The base 
obtained in this manner, converted into a platinum-salt and submitted in this form to 
analysis — 
0*1040 grm. of platinum-salt left 0*0334 grm. of platinum. 
Experimental percentage. Theoretical percentage in the platinum-salt 
of triethylamine. 
32*11 32*11 
Accordingly, the base which had distilled over, had evidently not been affected any 
farther by the influence of bromide of ethyl. The appearance however of the opake 
crystals indicates that a second compound is formed, whose careful study is necessary 
for the elucidation of this reaction. I am at present engaged with this part of the 
inquiry. 
