66 PROCEEDINGS OF THE AMERICAN ACADEMY. 



At 67°-G8°, after the twelfth distillation, 10 grams of oil collected, 

 which gave as its vapor density 3.01 ; required for hexaue, 2.98. 

 The distillates 75°-85° will be considered with the aromatic series. 



At 87°-93°, after the eighth distillation, the distillates amounted to 

 115 grams, and after the fifteenth, 20 grams distilled at 90°-91°, bar. 

 745 mm. A vapor density determination of this product gave 3.51 ; 

 isoheptane, C7H14, requires 3.46. 



At the end of the seventeenth distillation, 80 grams collected at 

 96°.5-97°.5, bar. 740 mm., which distilled constant within these lim- 

 its. A determination of its vapor density gave 3.63 ; required for 

 heptane, 3.46. The composition of this oil was further established by 

 analysis : — 



0.1870 gram of the oil gave 0.5781 gram CO2, and 0.2514 gram H2O. 



Outside of the limits of temperature within which the hydrocarbons 

 Qi^2h + 2 liave been found, the distillates below 105° have been sub- 

 jected to prolonged distillation, but the quantities collected were so 

 irregular, gradually separating into higher and lower constituents, that 

 it excluded the presence in any considerable quantity of other bodies. 

 The fractions in the vicinity of 111° will be described later, in the 

 examination for toluol. 



Concerning the distillates collected at 118°-119°, the observations 

 on the corresponding fractions from Ohio oil apply equally here. 

 At 118°-119°.5, the distillates amounted to 90 grams after the 

 fifteenth distillation. A vapor density determination gave 4.02 ; re- 

 quired for octane, CgHie. 3.94. As in the case of the Ohio products, 

 this fraction was purified with much care, and the following determi- 

 nations of carbon and hydrogen were made : — 



I. 0.2013 gram of the oil gave 0.6226 gram CO^ and 0.2738 gram 

 H2O. 

 II. 0.2036 gram of the oil gave 0.6318 gram CO, and 0.2799 gram 

 H2O. 

 III. 0.2045 gram of the oil gave 0.6324 gram CO2 and 0.2762 gram 

 H2O. 



