THE THEORY OF TERRESTRIAL MAGNETISM. 409 



When m- 3, X 3 3 = (l -/*') (- 3/t), 



301 6 _2415 4 343 ,_ 7 



1(1' Q O O Q 4 7 *-i ' Q O Q 



/ O^O O^O O i O 



When m = 4, A r 4 4 = (l -/i 1 ) 1 ( -4/*), 



19 f 323 ' 323 

 When m = 5, X* = (l p*)* ( - 5/x), 



A. II. 



52 



