580 PROCEEDINGS OF THE AMERICAN ACADEMY. 



I. 1.1039 grm. of the oil and 39.7462 grms. benzol gave a depression 

 of0°.575. 

 II. 1.1418 grm. of the oil and 36.2175 grms. benzol gave a depression 

 of 0°.505. 



Calculated for Found. 



C 19 H, . I. II. 



268 269.5 268 



Determinations of carbon and hydrogen gave values for the series 



T. 0.1530 grm. of the oil gave 0.4771 grm. C0 2 and 0.1994 grm. H 2 0. 

 II. 0.1591 grm. of the oil gave 0.4976 grm. C0 2 and 0.2132 grm. H 2 0. 



Analysis I. was made of the oil before purification, and Analysis II. 

 afterward. 



A determination of the index of refraction gave 1.4522, which cor- 

 responds to the following molecular refraction : — 



Calculated for C 19 H 40 . Found. 



89.55 88.68 



The results on the composition of the distillate 210°-212° were ob- 

 tained on the purified distillate without cooling to separate the solid 

 hydrocarbon. On cooling a portion of this distillate to —10°, filtering 

 cold and pressing the solid, 5 grams of the solid hydrocarbon, and 30 

 grams of the liquid hydrocarbon were obtained ; the solid hydrocarbon, 

 therefore, formed a small part of the original distillate. The specific 

 gravity of the filtered oil was 0.8208 at 20°. The specific gravity of the 

 distillate before cooling as shown above was 0.8122 at 20°. 



'After crystallization from ether and alcohol, the specific gravity of 

 the solid hydrocarbon was 0.7725, !£, and 0.7781 at |£. 



A determination of its molecular weight gave a value required for the 

 hydrocarbon Ci 9 H 40 . 



1.4011 grm. of the solid and 26.66 grms. benzol gave a rise of 0°.496. 



Calculated for C 19 H 40 . Found. 



268 271.6 



