S. P. Sadtler on Iridium Compounds. 339 
The range of this last class, as can be seen, is very wide; one 
of the most prominent of these compounds, however, and one 
. which exercised for some time a very considerable influence 
| ea upon the theoretical views held at that time, is the compoun 
0 
C,H, + 1. . . > 
The investigation I now undertook was to see if a similar 
base of iridium could be prepared. Various considerations, 
ammonium in solution, and, passing a stream of chlorine 
through to break up the chloride of ammonium, to then conduct 
ethylen gas into it, was unsuccessfu The method which suc 
ceeded most perfectly was to act upon iridium chloride. This 
er experiment, to see i 
Upon the rCl,, a it and uniting at the same time, was 
Unsuccessful. : 
_ It will thus be seen, that the only method of ig agar the 
iridium-base is by the reducing action of alcohol on indium 
chloride, according to the reaction :— 
IrCl, Ohape fe Wigs es =sTyOls OH + 2101+) +H,0 
— <2" 6,08" bn,\0H H 
Hr cermin Mg? ; : 
7 produce of which are iridium-ethylen-protochloride, hy 
_ drochloric acid, aldehyde and water. dikes 
The purifying of the necessary iridium was foun be 
prey iene aa Codes operation, the last traces of platinum 
