184 EXAMINATION OF A NAPHTHA FROM LIME-SOAP. 
Capacity of balloon, . . ‘ ¥ 3 s - F 2 ‘ é 5 : 5 z « O17 tras 
Air remaining in balloon, . —. . > hp gs Ot ; . , e . 2 Sec. 
Height of barometer, . . , . ‘ , dap 3 6 ; . F - 755.4mm. at 19° 
_ Density of vapor found, . . we Ow : . 4 ‘ ne ® . e. aes ve 3.001. 
“ 6 theoretical, (Cig Hiz), . ‘ . ‘ é P ‘ P - ‘ i 2.9046. 
The sp. gr. of the liquid was found to be 0.6938 at 0.° A portion of the fraction 
672°-68°, purified as above, and now boiling at 68.5°(corrected), being analyzed, af- 
forded the following result: 0.159 grm. of the hydro-carbon gave 0.2176 grm. water, 
and 0.4935 grm. carbonic acid, or carbon 84.65 % and hydrogen 15.22 %. Taken in 
connection with the boiling point of this body, and its petroleum-like odor, the analysis 
points at once to that hydride of caproyl which boils at 68°-69°, and which: has been 
isolated from coal-oil by Greville Williams,* Schorlemmer, and others. 
The method of purification with monohydrated sulphuric acid was here resorted 
~ to, in the hope that by this means the caproylene with which the body was supposed 
to be contaminated might be removed. The action of the concentrated acid, so far as 
the destruction of impurities is concerned, was apparently feeble; the acid did not even 
blacken, but only became yellow, though some warmth was evolved, and hence only a 
single portion of it wasemployed. But the acid evidently combined with a considerable 
portion of the hydro-carbon, a certain quantity of a compound much less volatile than 
the hydro-carbon being formed. After having been decanted from the acid sediment, 
washed with caustic alkali, and dried over chloride of calcium, and then heated in an 
ordinary retort, the hydro-carbon began to boil at 72°, the temperature gradually ris- 
ing, as the distillation proceeded, to 81°, at which point the operation was interrupted 
and the oily residue in the retort put aside. On redistilling this distillate upon sodium 
almost all of it came over at 69.5°(corrected). 
The last named product was now analyzed with the following result: 0.1111 grm. 
of the hydro-carbon gave 0.1633 grm. water, and 0.3417 grm. carbonic acid, or 
Found. Theory. 
Carbon 83.89 Cire 83.72 
Hydrogen 16.38 Hu = 16.28 
100.27 100.00 
It is evident, therefore, that this body, boiling at 68°-69° (corrected), is probably iden- 
tical with the hydride of caproyl of Schorlemmer, and of Warren; and that the 
concentrated sulphuric acid did really remove caproylene from the product first 
analyzed. 
* Philosophical Transactions, 1857, CKLVII. pp. 452,461. 
