592 PROCEEDINGS OP THE AMERICAN ACADEMY. 



On cooling the original distillate to —10°, it formed a thick pasty 

 mass. It was filtered under pressure, keeping cold. The filtered crys- 

 tals were pressed, and crystallized from ether and alcohol. Melting 

 point, 58°. The solids pressed out from the fractions from 288° to 

 302°, 50 mm., showed very slight variations in melting points. 



288°-290°, 56°. 300°-304°, 59°-60°. 



294°-296°, 58°. 302°-304°, 59°-60°. 



The oil filtered under pressure was very thick and viscous. Its 

 specific gravity at 20° was 0.8688. A combustion gave the following 

 percentages of carbon and hydrogen : — 



0.1500 grm. of the oil gave 0.4750 grm. COg and 0.1812 grm. U.O. 



Calculated for C27H52. Found. 



C 86.17 86.36 



H 13.83 13.43 



Its molecular weight at the boiling point of benzol corresponded to 

 the formula C27H52. 



3.6506 grms. of the oil and 25.80 grms. benzol gave a rise of 0°.964. 



Calculated for C27H5J. Found. 



376 376.2 



The index of refraction corresponded to the same formula. 



The index was found to be 1.4722, and the molecular refraction: — 



Calculated for C27H52. Found. 



122 121.4 



octocosane, c28ii58, and liquid hydrocarbon, c28h54. 

 From Distillate 310°-312°, 50 mm. 



After the tenth distillation 75 grams collected at 310°-312°, from 

 which a considerable quantity of crystals collected above the oil on 

 standing. The oil separated from the crystals was then cooled to — 10° 

 and filtered cold under pressure. The solid was pressed and purified 

 by crystallization from ether and alcohol. Melting point 60°. Its 

 specific gravity was determined as follows : — 



70°, 0.7945 80°, 0.7927 90°, 0.791 1' 



