410 THE THEORY OF TERRESTRIAL MAGNETISM. 



-X.'- (1 -/*)- V + /*- 



When m = 6, JT 6 6 = (1 -/i') 1 ( - 6^), 



12 



72 a _ 3 

 124 



When m - 7, Z/ = (1 - ^ 2 ) 3 ( ~ 7 / A )> 



-XXl-VK-KV+igP'-ig 



\ 



When m = 8, X* = (l -/*')* ( - 8/t), 



When m = 9, -X, 9 = ( 1 - /^ 2 ) 4 ( - 9/t), 



When m = 10, ^ = (1 -/')* (- 10/). 



