C. G. Rockwood— Recent American Earthquakes. 25 
Art. III.—Notices of Recent American Earthquakes—No. 6; by 
Prof. C. G. Rocxwoop, Jr., Rutgers College. 
In the following notices, facts given by single newspaper 
reports, and which could not be otherwise verified_are printed 
in smaller type, and the source from which they were obtained 
is indicated. 
For information received I am indebted to John M. Batch- 
elder, of Boston, and Samuel Barnet, of Washington, Ga. 
1874. 
May.—The disturbances at Bald Mountain, N. C., in February 
and March, already noticed (III, ix, p. 332) were reported as con- 
tinuing at intervals during the months of April and May. (U.S. 
Signal Service. 
July 23.—A light shock at Camp Russell, Neb. (U.S. Sign. 
rv 
Aug. 3.—During the evening a light shock from the east at 
Clifton, San Bernardino Co, Cal. (U.S. Sign. : 
Dec. 12.—A slight shock between 10 and 11 p. M. at Garri- 
son’s, N. Y. 
1875. 
_ January.—Earthquakes preceded and accompanied an pia 
tion of the volcano Trélladyngja, in the central part of Iceland. 
The volcanic disturbance appears to have begun by subterra- 
nean thunders during December, 1874, extending through 
nearly two-thirds of the island. Early in January, 1875, earth- 
quakes occurred in all directions and then an old extinct vol- 
cano near Vatrayskud opened and for four weeks continued to 
emit ashes, lava, ete. When this eruption ceased, another ex- 
tinct voleano near Myvatu, 100 miles farther north, opened and 
continued in action for several weeks. Both of these eruptions 
occasioned great destruction of life and property. Karly in 
March there seemed to be a general upheaval of the earth in 
the whole central portion of the island. The ashes from these 
or still later eruptions fell to the depth of several inches on the 
coast of Norway in the latter part of April. It is stated that 
“the geysers have dried up since the eruption began, and in- 
Stead of water emitted quantities of hot smoke and ashes.” 
Jan. 24—A heavy shock at 4 A. M. in Butte, Plumas, and 
Sierra counties, Cal.; felt also at Sacramento, Cal., and Carson 
ity, Nev., where two shocks were reported, the first light, the 
second quite severe and lasting several seconds. The direction 
was from the northeast. 
Feb, 7.—Two severe shocks at San Francisco, Cal., the first 
at 10.56 and the second at 11.50 A. M., each lasting two to four 
Seconds. (U.S. Sign. Serv.) 
