312 Friedel and Crafts on the combinations of 
tinued to over with the vapor; the apparatus was then 
cleaned me gaye operation commen need. As an example of a 
number of such operations, we may cite one series in which 769 
s. of zinc-ethyd and 480 grms. of chlorid of silicon were 
Sanlayed. We obtained 225 grms. of perfectly pure silicic- 
ethyd—about half the theoretical quantity. 
In order to understand the phase of the reaction, Wa 
results in ee formation of gaseous products, and of metallic 
¢, we examined the gases, which were given off on cones 
the digester, by. ences them through bromine, freeing the gas, 
ich was not absorbed, from the excess of bromine, and col- 
letting it over mercu The quantity evolved in an operation 
is very large, and there was no difficulty in using the first por- 
tions of the gas to remove the air from et apparatus containing 
bromine, and in collecting at the end a perfectly pure sample 
for analysis. 
The e analysis of the gas, which was not absorbed by bromine, 
gave 
Volume of the yas_ - - - ~ = OFF 
Oxygen added - - . 27°72 
Contraction - - - . 2 9840 
Carbonic acid 10°26 
Remaining pe determined Ba deto- 
: Peg 9°50 
Consequently two ila of the gas contained 6:12 volumes 
of H, and 1-98 volumes fa carbon vapor. 
second analysis | 
Volume of gas - sere - = 666 oO] 
igen ad ee ae 26°61 : 
Contraction - ae : 17°30 
Carbonic acid - - - - 13°02 
Remaining oxygen - - - - 2°04 
Two volumes of the gas contained 6:36 volumes of H, and 
1:96 volumes of carbon vapor. 
The gas was the hydrid of ethyl C,H,, two volumes of vie 
contain six volumes of hydrogen and two volumes of 
va 
The bromid which was obtained by the absorption of a part 
= ——- by bromine, after having been washed with a solution 
caustic potash, dried and distilled at 132°-184°, was analyzed 
—. the following result : 
5 Substance =0°3695 grms. ; AgBr=0-7315 grms. 
IL Substane =02712 grins. ; CO, =0'1330 grms. ; H, 0=0-0608 
13259 grms. ; CO, =01600 grms.; H, 0=0-0690 
