84 Geographical Notices. 
_ Of the above mentioned maps, Nos. 1 and 2 will accompany the first 
volume of the Report. Nos. 4, 5,and probably 6, the second volume. ~ 
It is intended, if the survey is carried to completion, to construct & 
final map of the State on a seale of six miles to the inch, in nine sheets, 
each about three feet square. ¢ 
series of observations, we found to be 14,440 feet above the sea level. 
This is the first of the lofty voleanic peaks of the Sierra Nevada which 
has been accurately measured. ‘ 
In the department of geology proper, our explorations have extended 
over portions of forty of the forty-six counties into which the State 1s 
divided; and when it is remembered that the average size of a county 18 
equal to half that of the State of Massachusetts, (California having just 
twenty-four times the area of that State,) some idea of the’ magnitude of 
our work may be obtained. The chain of the Sierra Nevada may be 
parallelized with that of the Alps for extent and average elevation; — 
while the Coast Ranges are nearly as extensive as the Appalachian chain 
of mountai é 
We have obtained a pretty clear idea of the general structure of the 
Coast Ranges from Los Angeles to Clear Lake; the vicinity of the Bay 
of San Francisco has been worked out in considerable detail, including — 
Australia. From the Lond. Geog. Soc. Proceedings (iii, 82), 
which we are indebted for so much information that illustrates — 
ns progress of British enterprise, we draw the following ¢* 
racts. @ 
# # 
“1, Explorations from Adelaide across the Continent of Australia; — 
by J. McDovatt Srvarr.—tThis expedition proceeded along the pre — 
vious route until they reached the point attained by Mr. Stuart in 1861, 
from which he was obliged to retire in consequence of the inability of 3 
his small party to penetrate farther. a ae 
} eee 
