PREFACE. 



The mngiietic survc}^ of Japan published in the present 

 volume was conducted under the authority of the Earthquake 

 Tnvestio-ation Committee durinor the four successive summers 

 1893-6. As will be seen from the complete list of observations, 

 the work is the result of voluntary co-operations of the observers 

 to whose skill and enthusiasm the success is due, and whatever 

 credit there is in the survey it must be attributed to them all, 

 the writer being merely in the position of reporter representing 

 their different parties. 



The observers were : — 



H. Omort, Rigakuhalcusl, 



Prof, of Seismology, Imperial University Tokyo. 



S. Nakamura, Eifffckusi, 



Now Asst. Prof, of Physics, Imperial University Tokyo. 



K. MizüSiMA, Rigahusi, 



Now K. Miyamoto. 



H. IwAOKA, Rujahusi, 



Now Prof, of Mechanics, Higher Technical School of TokyH. 



H. KiMURA, Rlgahusi, 



Now Director of the International Latitude Observatory, 

 Mizusawa. 



K. TuRCTA, Rigahuhahusly 



Now Prof, of Physics, Imperial University Tokyo. 



K. UzriE, Rigakusi, 



Now Director of the Middle School, Sendai. 



A. Imamura, Rlgahusi, 



Now Asf^t. Prof, of Seismology, Imj^erial University Tokyo. 



y. Kato, Rigakusi, 



N<~>W y. HoiMMA, 



