EXAMINATION OF NAPHTHA FROM RANGOON FETROLEUM. 213 





noticed that an abundant crop of crystalline plates had separated out in the fraction 

 which boiled at 208° (corrected), and the fraction next above, namely, 209" (corrected). 

 The quantity of these crystals was large as compared with the amount of liquid from 

 which they had been deposited. After they had been removed from the liquid, a 

 second crop of crystals was obtained from the same fractions, by cooling them in a mix- 

 ture of ice and salt. These crystals were specially abundant, as before, in the fraction 

 208° (corrected) ; but no crystals were obtained, by the treatment with ice and salt, 

 from any of the neighboring fractions, or from any of the fractions in the heap at 

 214.6° (corrected). Nor were any crystals deposited during the continuance of the 

 cold weather from any of the other products which we have obtained from the Ran- 

 goon naphtha. The crystals from fractions 208°, 209° (corrected), were allowed to 

 drain and were then pressed gently between folds of filter paper so long as any oil 

 could be thus removed from them. During these operations the crystals remained 

 unchanged ; excepting in so far as they developed the unmistakable odor of naphthalin, 

 Like those of pure naphthalin from coal-tar, the crystals were not very soluble in cold 

 spirit, but on warming the spirit they dissolved in the same manner as crystals of pure 

 naphthalin. In cold ether they dissolved in the same way. as the crystals of naphthalin, 

 and crystallized out again like naphthalin ; a portion of the crystals in each case, that is, 

 both the crystals from Rangoon naphtha and those from coal-tar, sublimed into the 

 upper part of the test-tube in which the solution was effected, and were deposited there 

 in the well-known characteristic plates. The crystals from fraction 208° (corrected) 

 melted at 74°. A portion of them having been maintained during some time at a 



mperature slightly superior to 90°, a sublimate of the characteristic plates already 

 alluded to was deposited upon the cold upper part of the tube above 



of 



heat 



On analysis, 0.167 grm. of the crystals first deposited from fraction 208° (corrected) 

 gave 0.1015 grm. water and 0.5729 grm. carbonic acid. Or, 



Theory 



Found. 



Carbon, 93.53 

 Hydrogen, G.70 



C20 93.75 

 Hs 6.25 



100.23 



100.00 



Cocinlyene = C 26 H 2 , The last heap in our series was at 226°-234°, the summit 

 of it being at 229°-232°, each of the fractions 229°-230°, 230°-231°, and 231°-232 

 being very nearly of equal size, though each was considerably larger than any others 

 in the heap. The fraction 230°-231° was a trifle larger than the others. The quan- 

 tity of liquid in the whole heap 226°-234° amounted to about 325 c. c. Above 234 



