244 B. Silliman on Illuminating Oil from California Tar. 
In another experiment undertaken with a view to “cracking,” 
&c., treating and redistilling with soda, the products were as fol- 
lows, stated in percentages of the whole quantity operated on, 
the several steps being as before. 
Naphtha,* sp. gr. about -760 at 60° F., - - 11°33 
Oil,t - sng. san gli aad - 66°22 
“ “ “c *s93 “ - ‘é 12°67 
4 Sc ieB ee 3:56 
Roy: ~2)a* patna se tee cos 6-22 
100-00 
The illuminating oil from both these experiments, after treat- 
ment with sulphuric acid and soda in the usual manner, acquired 
an agreeable odor, a light straw-yellow color, and burn 
well in a lamp as good commercial oil. : 
With a view to test the effect of heat aided by pressure 1n 
breaking up the heavy hydrocarbons—a method of treating 
Light oil, sp. gr. 825 at 60° F,, - - 192 p. c 
eavy $ “ 88 “ as % 95°86 “ 
“ 6s “6 ‘918 * ‘“ “a oe 38°14 “ 
Coke, loss, &c., - - - - - 16°80 “ 
100-00 
The illuminating oil from the last experiment flashed at 80° F. 
and lighted on the surface at 85° F., showing the presence of 
naphtha or some very light body, the quantity of which cannot 
be very considerable. The light oil could with care be taken 
those of less density, will occur more speedily. e experi: 
ments herein mentioned gave nearly the same result whether 
* This naphtha caught fire from a match at an atm eric temperature of 56° F. 
¢ This oil flashed at 1is°F, aebigupes ase Be 
