apart), but are rather intended to indicate the
tendency presented by these phenomena to exhibit this internal activity,
during successive days, weeks, or even months, along a given great
circle of the earth, especially one or more of those connected with the
land center; perhaps most of all along the great circle which forms the
prime vertical, when the center of land is placed at the zenith.
In order to test the above, let us examine the record of the most
prominent earthquakes or volcanic eruptions for the year 1883.
Late in Dec., 1882, and early in Feb., 1883, shocks occurred in New
Hampshire; on Jan. 11, 1883, also at Cairo, Illinois, and about the same
time at Paducah, Ky.; Feb. 27 at Norwich, Conn., and early in Feb. at
Murcia, Spain.
These, by examination of any good globe, will be found on a belt forming
one and the same great circle of the earth.
Late in March and during part of April the volcano of Ometeke in Lake
Nicaragua was active (after being long dormant); Panama, portions of
the U.
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