102 
DR. A. W. HOFMANN’S RESEARCHES REGARDING THE 
hydrochlorate, a deep orange- red oil is deposited, which solidifies, sometimes only 
after half a day, with crystalline texture. If a moderately concentrated solution 
be employed, the salt crystallizes in the course of a few hours in magnificent yellow 
needles, often of an inch in length. On account of its great solubility in water and 
alcohol, it has to be washed with a mixture of alcohol and ether, in which the latter 
predominates. It may be dried at 100° without decomposition. 
On analysis the following numbers were obtained : — 
0*3550 grm. of platinum-salt gave 
of water. 
0*1812 grm. of platinum-salt gave 
The formula 
Ci6 Hxi N, 
requires the following values : — 
16 equivs. of Carbon .... 
12 equivs. of Hydrogen . . . 
1 equiv. of Nitrogen .... 
3 equivs. of Chlorine .... 
1 equiv. of Platinum .... 
1 equiv. of Platinum-salt . . 
0*3275 grm. of carbonic acid and 0*1055 grm. 
3*0545 grm. of platinum. 
, PtCl^ 
Theory. 
Experiment. 
f 
96*00 
29*34 
29*24 
12*00 
3*66 
3*83 
14*00 
4*29 
106*50 
32*55 
98*68 
30*16 
30*07 
326 18 
100*00 
Terchloride of gold and protochloride of mercury yield with solutions of ethylani- 
line yellow oily precipitates, which are very readily decomposed. 
Of the products of decomposition of ethylaniline, I know as yet almost nothing, 
although they will not be deficient in interest in a theoretical point of view. 
The action of bromine gives rise to the formation of two compounds, both crystal- 
line, one basic, the other indifferent and corresponding probably to tribromaniline. 
Neither of these substances has yet been analysed. 
On passing cyanogen into an alcoholic solution of ethylaniline, short yellow prisms 
are deposited after some time, which are evidently cyanethylaniline, Cy, Cjg Hn N, 
corresponding to cyaniline and cyanocumidine*. This new cyanogen-base dissolves 
in dilute sulphuric acid, and is thrown down from this solution by ammonia in form 
of a floury precipitate. The hydrochlorate, like the corresponding cyaniline-salt, is 
very insoluble in hydrochloric acid. It may be obtained in fine crystals on addition 
of hydrochloric acid to a solution of the base in dilute sulphuric acid. Cyanethyl- 
aniline, like cyaniline, forms a very soluble platinum-salt. 
I have made also some qualitative experiments respecting the deportment of ethyl- 
aniline with chloride of cyanogen. This gas is rapidly absorbed, much heat being 
evolved. On cooling, the mass solidifies into a resinous mixture of a hydrochlorate 
and a neutral oil, which separates on addition of water. The base separated from 
* Chemical Society, Quart. Journ. i. p. 159. 
