C. M. Warren on the Volatile Hydrocarbons. 107 
Specific gravity.— 
At 0°, before treatment with HOSO,, = 0°8697 
At "; after +“ “ “ 0°8724 
At 14°, before - “ s ee 0°8592 
Determination of Boiling-point before Treatment with Sulphuric 
cid.—The preparation was found to distil to dryness between 
175°'8 and 177°. The temperature remained absolutely constant 
at 176° during the lapse of ten minutes, and occupied fifteen 
minutes in rising from 176° to 176°5. Taking the mean of the 
former numbers, viz: 176°-4, and applying the proper correc- 
tions for pressure, ete., we obtain 179°'5 for the boiling-point of 
cymole, 
_ After Treatment with Sulphuric Acid—The preparation dis- 
tilled to dryness between 176° and 177°, the temperature remain- 
ing thirteen minutes constant at 176°-8, indicating that no essen- 
tial change in the boiling-point had been produced by the acid 
treatment. It was nevertheless evident that some impurity was 
being removed by the acid, as the first portions of the latter be- 
came dark-colored and thickened on being agitated with the oil. 
uccessive portions of acid were therefore employed, until it 
ceased to produce any marked effect. 
Analysis before Treatment with Sulphuric Acid.—01589 gram 
of cymole gave, by combustion in a stream of oxygen gas, 0'5200 
of carbonic acid, and 0°1532 of water. 
Calculated. Found. 
Carbon, Ca, 120 89°55 89°25 
Hydrogen, H,, 14 10°45 10°71 
134 100-00 99:96 
After Treatment with Sulphuric Acid, and Distillation in Vacuo. 
—0°1623 gram of cymole, by combustion in a stream of oxygen 
gas gave 0°5324 of carbonic acid, and 0°1561 of water. ; 
Calculated. Found. 
Carbon,  C,, 120 89°55 89°46 
Hydrogen, H,, 14 10°45 10°68 
134 100-00 100°14 
