EXAMINATION OF A NAPHTHA FROM LIME-SOAP. 20 1 



we have just now alluded to; this compound, of P. & C, is in any event uncon- 

 formable with either of the series of hydrides which are known to xiat in petroleum. 



It is of course always possible that cases ma) 



from insufficient qua 



ties of material, it will be impracticable to continue the proce-s of distillation until a 

 constant boiling point has been reached; indeed, this inability will in most instances oc- 

 cur, in due course, at either end of every long series of fractions which have been ob- 

 tained as in the present case from a complex mixture of substances; we would insist 

 only upon the fact that doubts as to the definite character of any small heap will be 

 far less likely to arise when the process of distillation has been carefully and methodi- 

 cally conducted from beginning to end. 



With regard to the bodies which we have obtained at or near 140° and 170°, it is no 

 doubt still conceivable that they are not really impure xylole and isocuinole, as we suj>- 

 pose, but new compounds, and the observations of Tollens and Fittig,* upon mixed 

 radicals of the ethyl and phenyl series, would seem to strengthen this thought; but u. 

 our opinion the weight of evidence is decidedly in favor of the view which places th< e 

 140° and 170° compounds in the benzole series. As we understand it, our own experi- 

 ence indicates that the members of the benzole series are peculiarly liable to retain a 

 certain portion of the more highly hydrogenized hydro-carbons so forcibly that these 

 cannot be readily separated by fractional condensation. 



Margarylene = C^ H^. At 193°-196° was a heap of about 6oU c. c. Its sum- 

 mit was well defined at 194°-195°, from which point it fell away gradually on either 

 hand through several degrees. It was treated with diluted sulphuric acid in the usual 



way, the first portion of acid becoming quite dark, and the second, third, and fourth 

 portions each less dark than the preceding. The hydro-carbon itself began to be 



colored on the fourth addition of acid. 



In an ordinary retort upon metallic sodium it boiled at 195.4° (corrected). 



On combustion, an un weighed portion of it gave 0.2721 grin, water, and 0.6478 grm. 



carbonic acid. Or, 



Found. 



Carbon 85.40 

 Hydrogen 14.60 



Theory. 

 C22 85.71 

 H22 14.29 



100.00 



100.00 



A determination of the density of its vapor gave the following result : 



Temperature of balance, 



24.5 



• 



* Annalen der Chemie and Pharmacie, 1864, CXXIX. 369 and CXXXI. 303. 



4 



VOL. IX. 30 



