TART. III. KARTH CURRKNTS AND KARTH MAGNETISM. CHAP. 



737 



Now forces of other origin will always be asserting themselves, but if we take into consideration 

 only those in which the similarity is greatest, and employ a large number of jags, the mean of all these 

 will give a more or less correct result, provided that an approximate proportion is always found to 

 exist between the deflections in respect of amplitude. 



For this purpose we have measured about 400 jags for Kaafjord, and about 100 for Bossekop. 



We give here some of these determinations, as also the calculated mean values. 



TABLE CXII. 



