Geology and Mineralogy. 415 
Eleventh Annual Report of the U. 8. Geological and Geo- 
peophioat Survey of the Territories, embracing ee and Wyo- 
—o. being a senor of progress for the year 1877; by F. V. Hay 
. 8. Geologist. 720 pp. 8vo, with numerous plates, seventy 
of xin illustrating rock sections, topography, scenery, tufa for- 
mations, and ten of fossils, besides six of m maps. Department of 
the Interior. Washington, 1879.—This thick volume, just out of 
press, bears evidence of the great activity and success in the 
explorations carried forward under Dr. Hayden. It is made up 
of a general report by Dr. Hayden, added _ work of the 
year; special iano reports by F. M. Enpricn, O. Sr. Jonny, 
nd Dr. A ALE; paleontological, ed C. x Whiter; and 
topographical, by ‘- D. Witson and Henry Gannerr. 
With more space at command, large sieatscies would here be 
made from the volume. 
6. Karthquuke of ve Salvador, of December 21-30, 1879.— 
A recent 0 from Mr. W. A. Goodyear, now Director of a Goy- 
ernmental Mining mis Geological Survey of San Salvador, states 
that more than 600 earthquake shocks were felt there within the 
last ten days of 1879. They were heaviest about Lake ee 5 
where he was on the 23d and until the 27th, when a shock ¢ 
as he writes, “ that broke the telegraph wire, and made the sine 
on which we stood a perfect network of cracks, opened new 
springs of ae increased the rivulets in the vicinity to ten times 
their volume, muddied the waters of the lake in many places, and 
rolled hundreds of thousands of tons of rocks and debris down the 
steep hills in the shape of land slides.” “As a sequel to the 
earthquakes, on the night of January 20th and 21st a new vol- 
cano appeared in the center of the Lake of Llopango. meio vol- 
inp holes, while i _ the Ven nango district, durin the same year, 
475 wells were drilled = the Counties of Warren, Venango, 
Clarion and Butler), and 122 were dry holes, or 25°7 per cent. 
