AMERICAN 
JOURNAL OF SCIENCE AND ARTS, 
[THIRD SERIES] 
Art, XXXV.—Review of von Seebach’s Earthquake of March 
6th, 1872, in Central Germany ;* by Ben K. Emerson, Prof. 
of Geology in Amherst College. 
uakes,§ and by William Hopkins in his celebrated Report on 
the Theories of Elevation and Earthquakes,| and although 
methods for finding analytically the depth of the center of 
disturbance from seismometric observations had been given in 
both these papers, and later in Mallet’s Earthquake Reports, yet 
the remark of Hopkins, that “the roughest 2 cM iat to 
the position of the focus from which such vibrations proceed 
would constitute a very important geological element,” re- 
mained as true in 1872 as in 1847, when it was written. 
the quarter century which intervened between these two dates, 
immense labor was bestowed upon earthquake-catalogues by 
Mallet, Perrey and others, and upon the discussion of these to 
determine geographical lines or areas of disturbance, periodicity 
im relation to the seasons, the phases of the moon, &c. ; 
* Das mitteldeutfje Erdbeben vom 6. Marj, 1872. Ein Beitrag yu der Lehre von 
ben Erdbeben von a von Seebach. , 
ia 
Proc. R. L. Acad., vol. xvi, 1846. ] Brit. Assoc. Rep., 1847. 
Am. Jour. Scr.—Tuirp — Vou. VIII, No. 48 —Dec., 1874. 
