q 
C. G. Rockwood— Recent American Earthquakes. 199 
21. The period of disturbance which began on this date 
in aa Salvador, C. A. (xix, pp. 299, 415) continued for several 
weeks, and during the last ten days of 1879 it was estimated that 
over six hundred shocks occurred, of which, however, only t 
were destructive, viz: those at 12.38 p. m., Dec. 27th, and 7.34 
P.M., Dec. 31. The center of disturbance was Lake Ilopango 
and the damage was confined to its immediate vicinity. 
20th a new volcanic cone a shea in the lake, a description of 
which, with illustration from photograph, appeared in Nature 
(June 10, 1880). Mr. W. A. Goodyear, State Geologist of San 
Salvador, made careful observations of the phenomena, and his 
_ 1880, Jan. 4. In connection ge: the eruption of volcanic dust 
in Dominica, W. I. (xix, p. 426); a letter Mr. L. Bert 
gy ae Rendus, Mar. 15, 1880) reports an earthquake shock at 
. at Marigot, a small village on the flank of the mountain 
shata in which the crater is situated. 
. wai 28, = and Feb. 10. Shocks and rumbling reported from Bald Mountain, 
Ml. B. 
Feb. 5. Advices of this date report recent earthquakes in 
various parts of Mexico, pera wee Sehriee of Cordoba, 
Orizaba, Tehuacan and Vera Cruz—Nat 
Feb. 8. The shock at Ottawa previously fone in small type 
(xix, p- diel is confirmed shies let 
March 2 6.25 aA. M. a Seal shock at Los ag Yeo Cal, 
lasting sina five standing vibration N.E. to S.W.—U. S, Weather 
March 25. At 2.30 a. m. a moderate shock at San Gorgonia, 
Cal, rent -pie — three dia direction S.E. to N.W.—U.S. 
We eath er Rev 
St ng 3. he 10 ep. M. a slight shock at Quebec and Ottawa.—J. 
ae aay, between 2 and 3 A. M., a shock at Fort Fairfield and Maysville, Me. 
April 14. A strong shock at San Francisco at 1.05 P. M. 
May 5. A slight shock repenes at San erg ty: from south 
to north, at 11 P. M., and at San Jose at 11.35 Pp. A heavy 
shock, presumably the same, was felt at Tlactula, State of 
Oaxaca, ita a on the same day, hour not stated; direction 
north to south. 
May 1 45 a, M, an earthquake was felt in northeastern 
Mesescinceae affecting the seaboard towns from Amesbury and 
| Newburyport ‘ to Salem, and inland to tae aii and Acton. At 
