942 B. Silliman on Illuminating Oil from California Tar. 
Dr. Andrews specially mentions the stratification of the drift 
oer in the Chicago tunnel, and that eat care it can 
observed in the greater part of the formation. The latter 1s 
is implied in the sentence quoted from Dana’s Manual. 
While angular blocks do occur in the stratified drift of middle 
and the lithological composition of the “Orange Sand ” of the 
Southwest is precisely such as we should expect to result from 
the modification, in proporti i 
portion to 
the agencies to which the stratified drift of the Northwest seems - 
to owe its conformation. 
University of Mississippi, Feb. 2, 1867. ‘ 
Art. XXX.—On Naphtha and Illuminating Oil from Heavy 
California Tar (Maltha) ; by B, SILLIMAN. 
Havine lately had an opportunity to examine a specimen of 
“surface oil,” so called, from Santa Barbara county, in Califor- 
e fluid form, and of every density, from 
those which are but little lighter t 
naphtha found in a natural state. , 
t is proper to state that the chemical examination of this 
sample had chiefly a technical object, to prove whether or oe 
illuminating oil of good quality could be obtained from the ais- 
