C. M. Warren on the Volatile Hydrocarbons. ° 99 
Distillation therefore occupied one hour and ten minutes, during 
which time the thermometer rose only 0°-6, being fifty minutes 
in rising 0°-2 from 79°-4 to 79°6, at which temperature it had 
distilled nearly to dryness. Height of the barometer during t 
experiment reduced to 0° =761-9™™, Taking 79°-4, this being 
the average of the last five observations, and applying the cor- 
rections for the upper column of mercury, and for atmospheric 
pressure, according to the directions given by Kopp,“ we find 
the corrected boiling-point of benzole to be 80°:1. 
Analysis,—0-2339 gram of benzole gave, by my process” of 
combustion in a stream of oxygen gas, 0°7903 of carbonic acid, 
and 0°1683 of water. 
Calculated. Found, 
Carbon, Cy 72 92-31 92°15 
Hydrogen, 4H, 6 7°69 7-99 
%s 10000 ~=—-:100'14 
Determination of Vapor Density.— 
Temperature of balance, 15° 
Temperature of oil bath, 171° 
Height of barometer, 764°1™™ at 9° 
Increment of balloon, 0°2447 
Capacity of balloon, 265 ¢. e. 
Density of vapor found, 2°688 
Theory, C,,H,=4 volumes, 2°698 
2. ToLUOLE.—Specific gravity, 0°8824 at 0°, and 0'872 at 15°. 
Determination of Boiling-point.—The preparation employed for 
this determination had also been repeatedly boiled with sodium 
until the latter ceased to have any action upon it. Operating am 
this case also upon a pretty large quantity, the distillation occu- 
pied about an hour. The experiment was conducted as detailed 
0°:6; 
under the head of benzole. Distillation commenced at 1 
rt of the retort becoming h 4 é SB peegeds: 
toluole. He found that toluole which, by ordinary distillation, 
eS. i ae 
mt she ae rena ri lr we 7 261, and this Jour., xxxix, 326. 
* Philosophical Magazine, 1855, [4], ix, 256. go gant. 
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