164 KNOTT AND TANAKADATE 



I am alone responsible. As a check upon my own calculations, 

 Messrs Asliino, llirayama, Knno, and Kimnra, gradnnting students in 

 Astrc^nomy, Mathematics, and I'hysics, kindly went through the 

 labour involved in combining the observations by the method of 

 least sf[uares. ]\Iessrs Nagaoka and Imagawa have, of course, always 

 been at hand and have rendered most efftcient aid throughout the 

 whole process of reduction. To Mr. Nagaoka especially are my best 

 personal thanks due for the many ways in which he has lightened 

 mv labours. — C. G. Knott. 



Arrangement of Matter. 



The Paper is di\'ided into Five principal Sections, as follows: 

 Section J. — Historic Retrospect and General Description of the 



Aim and Methods of the Present Survey. 

 Section IT. — Particular Account of the Erpiipmont and Modes 



of Operation of the Northern Party. 

 Section HI. — Particular Account (^f the Erpiipment and diodes 



of Operation of the Southern Party. 

 Section TV. — Final Reduction of the Observations and General 



Conclusions. 

 Section P.— Comparison of Results with those of previous 



Observers. 



Section I . 



The earliest determination of any of the magnetic elements in 

 Japan was probal)ly made by Inô* about the beginning of the 

 present century. In all the charts which were at that time made by 



* This Inö was certainly a reuiarka))le man. As an Apppndix to the present Memoir T 

 give a short liiography. 



