260 C. G. Rockwood—Notices of recent Harthquakes. 
these agents and electricity would lead us to conclude that this 
agent also is the result of vibrations in the same medium, or at 
least that it is a force capable of being propagated through the 
ether, with a velocity similar to that of light. While this influ- 
ence is traveling through the void celestial spaces it develops 
no light, but as soon as it encounters the earth’s atmosphere, 
which appears to extend toa height of about 500 miles, it devel- 
ops light, and its movements are controlled by the earth’s mag- 
netic force, in a manner analogous to the influence of an artifi- 
cial magnet upon a current of electricity circulating round it. 
Art. XXVII.—Notices of Recent Earthquakes; by Prof. C. G. 
Rockwoop, Jr., Bowdoin College. 
April 3,1872. ‘A letter from Beyrout gives some statistics 
of the earthquake at Antioch in April last.* Before the shock 
there were 3,003 dwelling houses in the city. Of these 1,960 
were ruined, and 894 so damaged as to be uninhabitable, leav- 
population was about 17,600, of whom 500 were killed and an 
equal number wounded. In Luedia there were 2,150 houses 
ruined, and more than 300 persons were killed or wounded.”— 
Boston Advertiser, Aug. 18, 1872. 
_April 24,1872. Nearly coincident with the eruption of Vesu- 
by showers of ashes and sand, which obscured the light of the 
sun, and some 150 persons are reported to have perished. e 
eruption was attended with slight shocks of earthquake. 
June 4, 1872. A slight shock was felt between 10 and 11 
p. M. at Chesterfield, Manchester and Ashland, Va., and also at 
Charlottesville, Va. ; 
June 17, 1872. A sharp shock was felt about 3 Pp. M. at Mil- 
he MEN, Ga. Brick buildings were jarred and windows rattled. 
uly 8, 1872. A short but distinct shock was felt at 103 P- 
M. at Chillicothe, Mo., accompanied by a rumbling noise. 
July 11, 1872. A sharp shock was felt at 5.25 a. M. across 
the southern part of Westchester Co., N.Y. It extended from 
the Hudson river to and across the western end of on 
Island Sound. The area affected would be pretty well cove 
by a circle described from New Rochelle, N. Y., as a center, 
* This Journal, III, iv, p. 4 
