216 EXAMINATION OF NAPHTHA FROM RANGOON PETROLEUM. 
From these analyses the following formule are derived : — 
I. (@)=Cy Hue; (2) = Cy Huss TL Cig iss TO Cig Hiszg IV. (a) = Cys Fys.2x 5 
(6) = Cys Hisiy V. Cig Hizg. VI. Cis Hires. VIL. Cys Aazsg VILL Cys Fizss. 
It will be observed that the fractions Nos. I. and IL are largely composed of hy- 
drides, — doubtless those of cenanthyl and of capryl, which boil at 98°, 120°, and 128°, 
— though still contaminated with hydro-carbons belonging to one or both of the 
C, H, series, or possibly even with toluole. Fraction No. HI. is probably a mixture 
of xylole, the foregoing hydrides, and members of the C, H, series, as before. The 
composition of fraction No. IV. indicates the probable presence of hydride of pelargo- 
nyl, boiling at 150°. Fractions Nos. V., VI, VIL, and VIIL are probably composed for 
the most part of pelargonene (Cj, H,s) contaminated with a little isocumole (Cys Hy). 
The comparatively small proportion of hydrogen found in the fractions which boil 
in the vicinity of 140° and 170° (the boiling points of xylole and isocumole), goes to 
corroborate the opinion of De La Rue and Miiller,; that Rangoon petroleum contains 
‘members of the benzole series, and is perhaps all the more pertinent in view of the fact 
that we have ourselves isolated naphthalin from the petroleum, as has been already 
stated. It is of course conceivable that the naphthalin alone may have contaminated 
the fractions in question, as well as the definite heaps which have been previously de- 
scribed, the analysis of all of which indicate the presence of a little less hydrogen than 
is contained in pure C,H, But this conception seems to us improbable ; the compo- 
sition of fractions 142.3°-144.3° (No. IIL) and 151.6°-153.7° (No. IV.), in particular, 
would appear to invalidate it. We may here say that on the whole our results have very 
much weakened the opinion, which at one time seemed to us to be not altogether im- 
probable, that the benzole-homologues obtained by De La Rue and Miiller might have 
resulted from the action of nitric acid in removing hydrogen from the more highly hy- 
drogenized hydro-carbons, and might not have been contained in the native petroleum. 
As the result of our examination thus far, it appears that the naphtha from Rangoon 
petroleum contains : — 
‘  Rutylene = Cap Heo boiling at about ‘ ‘ ' : 175° 
Margarylene = C22 He2 ts ene a! BS , F - 195° 
Laurylene = Coa H24 « We . . i ‘ 215° 
Cocinylene = C26 Has “ oo P ‘i ‘ ‘ a 285° 
: Naphthalin = C29 He. 
Also, probably, Pelargone = C,, Hyg, boiling at about 155°, and members of one or 
both of the series of hydrides; it being a fair presumption that we have had in our 
hands the Hydrides of Ginanthyl, of Capryl, and of Pelargonyl. Our experiments also 
indicate the probable presence of Xylole and Isocumole. 
1 Proceedings of the Royal Society of London, VIII, 225. 
Boston, June, 1865. 
