592 PROCEEDINGS OF 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°. 800°-304°, 59°-G0°. 



294° -296°, 58°. 302°-304°, 59°-60°. 



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

 specific gravity at 20° was 0.8G88. A combustion gave the following 

 percentages of carbon and hydrogen : — 



0.1500 grin, of the oil gave 0.4750 grm. C0 2 and 0.1812 grm. II 2 0. 



Calculated for C 27 II C2 . Found. 



C 80.17 86.36 



II 13.83 13.43 



Its molecular weight at the boiling point of benzol corresponded to 

 the formula C 27 II C2 . 



3.650G grms. of the oil and 25.80 grins, benzol gave a rise of 0°.9G4. 



Calculated for C 2; II 52 . 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 fcr Cj 7 H M . Found. 



122 121.4 



OCTOCOSANE, CagHss* AND LIQUID HYDROCARBON, C 28 II C4 . 



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. Meltiug poiut 60°. Its 



specific gravity was determined as follows : — 



* 



70°, 0.7945 80°, 0.7927 90°, 0.7911 



