10 S&S. F. Peckham on the Distillation of Hydrocarbons. 
cessfully, and it was with extreme satisfaction that I saw at 
the time, in the October number of the Chemical News for 
small, and should*be enlarged sufficiently to enable the pressure 
to be regulated by weights instead of by a spring. 
With a pressure of between 30 and 40 pounds per square 
inch (the exact amount was not ascertained) the following re- 
sults were obtained. See table, page 11. 
o. I was an oil procured from one of the tunnels of the 
Hayward Petroleum Company, of a specific gravity of ‘9023, 
yielding by distillation in a common still about 15 per cent of 
light oil, of a specific gravity of ‘810, with about 40 to 50 per 
cent of “ middlings,” and 20 per cent of light lubricating oil. 
No. II came from the celebrated Pico Spring, yielding the 
lightest oil of any natural outcrop in southern California. Its 
specific gravity was ‘8932, and it yielded to treatment by the 
ordinary method only about 20 per cent of illuminating oil of 
the proper density. 
No, {II was from the Cafiada Laga, of a specific gravity of 
‘9184, and yielding by the ordinary process only 3 per cent of 
illuminating oil. 
by ordinary treatment, by distillation under pressure are sub- 
jected to what is technically termed “cracking,” and made to 
yield from 28 to a a cent of oil fit for burning, and rendered 
thereby nearly as valuable as the crude oils of Pennsylvania, 
23 Sei al 
