■Jt 



It therefore iH)|x?;ii-s jinilialili' tluit tlie intc-nsity nl' magiietizatioii had sliglitly 

 ilimiiiif-hed in Imth iiiay;ncts aiul tliat the aiinuiiit (if this (liiuiinitidii was some- 

 what <jr('atev iti (Hi tliaii in (A). If tlie mean of the times of vilaalioii hefoie 

 ami after the ascent of tlie mountain be accepted as the true periods, the results 

 will appear as follows : 



(at Tnkio 10:635 



...ul 



on the mountain 10.003 



„ fat Tokio 9.551 



(on the monnt<nn 0.827 



The relative intensities of the twu niaL^netie fields heini;- inx'ersely as the 

 squares of the times of vibration of the same ma,i;-net, it fallows that the value 

 of II on the summit of the mountiiiu compared with that at Tukin will be; 



from (A) 951 



„ (B) ._945 



mean 948 



Wiiile these two macjnets agree well in showing that the horizimtal inten.dty 

 is al)otit five i>er cent less on the summit of the mountain than it is in Tokio, 

 yet it must 1k3 remembered that the magnets were vilirated in the same [ilace and 

 under the same circumstances upon the summit. An examination of the loose 

 fragments of lava found upon the summit reveals the fact that nearly, if not 

 «luite, all of them arc slightly magnetic. It is therefore highly probable that 

 results diflering materially frcmi those given above might have been obtained, 

 had the location of the vibrating magnet been changed. Unifortunafcly it was 

 impo.ssible, in the few days during which the party remained upmi the summit, to 

 make suitable arrangements for repeating the vibrations at dill'erent points but 

 it is hoped that a complete magnetic survey of the mountain may be undertaken 

 in the near future. 



