146 RESEARCHES ON THE VOLATILE HYDROCARBONS. 
and five minutes later to 110°.8, at which point, having distilled nearly to dryness, the 
operation was suspended. The corrections for pressure (—0°.16) and for the upper 
column of mercury — which, with the thermometer used in this experiment, was only 
7 in length, — gives 110°3 as the corrected boiling-point of toluole. Church* re- 
marks that toluole, when distilled in the ordinary manner, is liable to become oxidized, 
and its boiling-point thereby raised, in consequence of the upper part of the retort 
becoming heated above the boiling-point of toluole. He found that toluole which, by 
ordinary distillation, had come over between 108° and 109°, would distil eight tenths 
between 103° and 104’, after repeated purification with sodium. I would therefore 
state that my preparation of toluole was never subjected to a temperature above its 
boiling-point ; and that I have never noticed any reduction of the boiling-point of this 
body by purification with sodium. 
Analysis. — 0.1628 gramme of toluole gave, by combustion in a stream of oxygen 
gas, 0.5447 of carbonic acid, and 0.1315 of water. 
Calculated. Found. 
SS eee 
Carbon, Cy 84 91.3 91.20 
Hydrogen, H, 8 8.7 8.97 
92 100.0 100.17 
Determination of Vapor Density. — 
Temperature of balance, . : : 2 . - 17° 
Temperature of oil bath, . : . : e ; 209° 
Height of barometer, . F : . - 760.1™™ at 15° 
Increment of balloon, z a . : : - 0.287 
Capacity of balloon, ‘ . , 4 ‘ - 249.5 ee. 
Density of vapor found, . ‘ . - 38.2196 
Theory Cy, Hs = 4 volumes, . » 3.1822 
3. XyLote. (Cumole of Mansfield and Ritthausen.) 
Specific gravity, 0.878 at 0°, and 0.866 at 15°.5. 
Determination of Boikng-point.— This determination was made in all respects like 
that of benzole, the xylole employed having been also subjected to the same treat, 
ment. The quantity operated upon was, however, smaller, and the experiment con- 
* Philosophical Magazine, 1855 (4), IX. 256. 
