ON THE yOLCANIC PHENOJIKXA OF JAPAN. 



435 



small, the observations were discontinued. The instrument employed 

 was a horizontal lever spring seismograph with an index having a multi- 

 plication of about 100. 



In addition to the above-mentioned work large numbers of other 

 investigations have been made. Amongst these may be mentioned a crude 

 attempt to carry out a seismic survey of Tokio, which, so far as it has 

 gone, shows remarkable differences as to the intensity of earthquake 

 movement and the number of earthquakes felt in different parts of the 

 city. The observations which have been made are extremely numerous ; 

 and as their analysis will occupy considerable time it is not yet possible to 

 report upon them. Another report which must also be reserved is the 

 work undertaken by a committee summoned by the Government to con- 

 sider questions relating to construction in earthquake countries. At my 

 suggestion a number of experiments are being made relating to the move- 

 ment experienced at the time of an earthquake on different kinds of 

 ground, the efficacy of different kinds of foundations, the experimental 

 determination of constants for the stability of masonry and brickwork to 

 suddenly applied horizontal stresses, &c. 



Catalogiie of Earthqualtes recorded at the Meteorological Ohservatory, Toldo, between 

 June I887 and June 1888 by the Oray-Milne Seismograph. 



No. 



Month 



Dav 



Time 



Period 

 in sees. 



Ampli- 

 tude in 



Direction 



Duration 



1887. 



M. 



41 

 IG 



2 

 42 





 41 

 12 



vertical motion ^ 

 3 7 42 P.M 

 17 

 27 

 14 

 47 

 59 



H. 

 1 



8 

 2 



7 

 8 

 2 

 3 



s. 



41 A.M. 

 57 A.M. 



35 P.M. 



39 A.M. 

 35 A.M. 



49 P.M. 

 26 P.M. 



10 

 8 

 5 

 6 

 



17 P.M. 

 P.M. 



29 P.M. 



42 P.M. 



15 a.m. 

 5 52 49 P.M. 

 vertical motion = 

 4 50 30 A.M. 

 3 23 23 P.M. 

 vertical motion = 

 8 12 50 A.M. 

 3 55 30 P.M. 



20 

 16 

 41 

 56 



A.M. 



52 P.M. 



41 P.M. 

 11 A.M. 



vertical motion = 

 3 54 51 P.M. 



abt. 

 abt. 



2 

 45 



5 

 24 



57 



31 P.M. 



P.M. 



P.M. 

 18 a.m. 

 16 P.M. 



S. 26° W. 

 E.-W. 



S. 22° E. 



S.S.W.-N.N.E. 



E.S.E.-W.KW. 

 E._W. 



S.E.-N.W 



E. 26° S. 



E.-W. 



E. 38° N. 



E. W. 



E.S.E.-W.N.W. 



E. 26° 30' S. 

 - N. 17° E. 



S.S.E.-N.N.W. 



1 30 

 10 



F F 2 



