354 PROCEEDINGS OF THE AMERICAN ACADEMY. 



The solid separated from the fraction 36G°-368°, after purification, 

 gave on analysis 85.41 per cent carbon and 14,74 per cent hydrogen, 

 corresponding to the series CnH2n+2) was present in only small quantity, 

 and probably differed but slightly from the hydrocarbon contained in the 

 fraction 342°-344°. 



The close agreement in composition of the untreated distillate, before 

 removing the solid hydrocarbon, to the series CnH2n_2, is due, as ex- 

 plained above, to the very small proportion of the solid hydrocarbon, 

 CnHon+o. The oils separated by filtration are evidently composed for the 

 greater part of the series C„Hon_2, although the low percentage of hydro- 

 gen may indicate the presence in small amounts of a series even poorer 

 in hydrogen. 



The untreated distillate 380° -384°, 50 mm., gave as its specific gravity 

 0.8336, and the solid hydrocarbon obtained by freezing, filtration, and 

 crystallization from ether and alcohol, 0.8052 at 80°. Melting point. 76°. 

 Determinations of carbon and liydrogen indicated the series CuH2q-2' 



0.1560 gram of the substance gave 0.4898 gram COo and 0.1943 gram 

 H,0. 



A combustion of the purified solid gave percentages of carbon and 

 hydrogen required for the series C„H2n+2- 



0.1501 gram of the solid gave 0.4695 gram COo and 0.1974 gram HjO. 



Calculated for BjjHjj. Found. 



C 85.37 85.33 



H 14.63 14.71 



The molecular weight of the solid as determined by the boiling point 

 method corresponded to the same formula. 



1.0012 gram of the substance and 24.72 grams benzol gave a rise of 

 0°.212. 



Calculated for CsbIIjj. Found. 



492 490 



As the molecular weights of the hydrocarbons of these series increase 

 the determinations become more and more diificult and uncertain. The 

 values obtained support, together with other data, the formulas given. 

 With the high boiling liquids there is less trouble than with solids. 



