130 PROCEEDINGS OF THE AMERICAN ACADEMY. 



formation of the chlorine derivatives. It is interesting to note that, with- 

 out purification, uupurified distillates give percentages of carbon and 

 hydrogen that correspond to the series C„Ho,,, or to numbers between 

 this series and the series C„H2„+2- The unpurified distillate 169°-170° 

 (730 mm.) gave the following results : — 



0.1521 gram of the oil gave 0.4758 gram COj, and 0.2018 gram U^O. 



Found. 



85.31 

 14.72 



The specific gravity of this distillate at 20° was found to be 0.7502. 

 Its vapor density, determined by the Hofmann method, gave the follow- 

 ing value : — 



0.1533 gram of the oil gave 74.6 c.c. of vapor at 182°, under a tension 

 of 414.6 mm. 



Calculated for C]oH2j. Found. 



4.92 4.86 



Evidently no particular value can be attached to sucli determinations 

 of vapor density, since, as shown by analysis, the oil is not composed of a 

 single body. The same is true of boiling points unsupported by other 

 values. The contaminating body frequently has the same or nearly the 

 same boiling point as the principal constituent, and after the removal of 

 the impurity the boiling point is not materially changed. Another por- 

 tion of the crude distillate was shaken with ordinary strong sulphuric acid 

 washed with caustic soda water, and dried with sodium. 



I. 0.1476 gram of this oil gave 0.4586 gram COo, and 0.1980 gram HoO. 

 II. 0.1674 gram of this oil gave 0.5190 gram COo, and 0.2263 gram HgO. 



C 



H 



The specific gravity of this oil was 0.7486. Its vapor density was 

 determined ; 0.1454 gram of the oil gave 73 c.c. of vapor at 182°, under 

 a tension of 410 mm. 



Calculated for CjqHj,. Found. 



4.92 4.75 



