PHYSICS OF THE GLOBE. 101 



er part executes movements similar to that of the earth; sec- 

 ond, no shock can occur without being immediately and per- 

 manently recorded ; third, the apparatus measures directly 

 the amplitude of the shocks, and shows them on an enlarged 

 scale. 



In the Canadian Naturalist (viii., 6), Principal Dawson gives 

 a short account of the earthquake of November 4, 1877. 



In Nature, vol. xviii., p. 265, is printed a list, communicated 

 by Dr. Meyer, of 41 earthquakes which occurred in the Phi- 

 lippine Islands in 1876, distributed as follows on the several 

 islands: Luzon, 33 ; Mindoro, 1 ; Masbate, 2 ; Leyte, 1; Min- 

 danao, 4. 



The first volume of the Annals of the Mexican Depart- 

 ment of the Interior contains articles on the National Observ- 

 atories, Astronomical and Meteorological, at Chapultepec,and 

 a lengthy report of the Commission appointed to investigate 

 the Earthquakes of Jalisco and the Eruptions of Ceboruco. 

 A catalogue of earthquakes, a list of altitudes, and other im- 

 portant data accompany the report; and a further detailed 

 topographical map is promised. 



Under the title of "Das Erdbeben von Herzosxenrath am 24 

 Juni, 1877" (Bonn, 1878), Dr. A. von Lasaulx has discussed the 

 phenomena of the earthquake of that date, reaching the con- 

 clusions that the centre of disturbance was at the depth of 

 16.85 English miles, and that the velocity of propagation was 

 17.7 miles per minute, the general direction being southwest 

 and northeast. 



In the Jahrbuch Vienna K. K. Geolog. Anstalt., 1878, p. 467, 

 Hans Holer reviews the works of Lasaulx on the "Earthquakes 

 at Herzogenrath in 1873 and 1877." He maintains, with abili- 

 ty, that neither was a central shock, therefore Lasaulx's results 

 as to depth and velocity are not trustworthy ; also that both 

 followed certain faults in the o-eolo2;ical strata, and that the 

 study of the faults and dikes are of first importance in un- 

 ravelling the phenomena. 



M. Ph. Plantamour, in Archives des Sciences Physiques et 

 Naturelles (Geneva), and M. F. A. Forel elsewhere, prove that 

 the phenomena known as Seiches, and consisting of occasional 

 rhythmical movements in the level of a lake ( Nature, vol. 

 xviii., p. 100), have no connection whatever with seismic dis- 

 turbances of its bed. During several earthquakes felt recent- 



