* 
98 C. M. Warren on the Volatile Hydrocarbons. 
Determination of Boiling-point.—This experiment was con- 
ducted in a tubu ee retort, operating on 150-200 c.c. of the 
benzole, containing some pieces of sodium. The benzole em- 
ployed had Lakes ytieen repeatedly boiled with sodium, until 
the latter c to have any action. The thermometer bulb | 
extended ive “the liquid” nearly to the bottom of the retort. | 
A second thermometer was attached, by means of flexible bands, | 
to the side of the one in the retort; the bulb being placed, dur- 
ing per at a point midway between the center of the cork 
(— e upper end of the mercurial column, viz: ote 35° 
A paper sho closely fitting the thermometer spindle as pla- 
ed across at the top of the cork. With the retort neck alight 
inclined upward, and cooled to prevent the escape of vapor, 
ebullition was continued for a considerable time, until the mer- 
cury in the thermometer ceased to rise. The lamp being removed 
for the moment, the neck of the retort was then turned down- 
ward, and quickly inserted in a Liebig’s condenser. On replac- 
ing the lamp, distillation commenced almost immediately at 79°. 
Observations.— | 
ndeed, with a F ccletiia ree that bottle cannot serv 
Temperature. Time. Temper. by side thermom, 
6 : a 
79°0 at 
a ae Pb ie 22°, 
79°4 “ 3.C0 12 sa 24°, 
19°5 + 3 12} 20 “a 25°. 
79°6 “ 8 = is Pr 26°, 
79°6 = 50 $6". 
ter convenience, etc., is A cna paces ear to be pr cope probably : 
ue to the fact that the more common specific gravity bottle . n nee ted to this _ 
is iguid, at a epted for taking specific gravities, even of volati 
it ead Gaecan I an 
we a 
in capaye above the ome on the apne ws 
neck is large enough to allow for the expansion o 
quent upon the elevation of t temperature 
rounding air; and that d saya etl so sn 
ee from eva 
xy an experimen 
In ey to furnish 
3 tical remarks ‘ion of of placi 
bulb gia ayes ; and for further en 
pts ee ee noi 
