168 P. E. Chase on Magnetic Inclination. 
By projecting on isoclinal and isogonic charts* the magnetic 
currents as indicated by the position of the needle in different 
portions of the globe, I have obtained the following results, 
which serve to show the character of some of these modifications: 
I. Deelination. 
1. The currents manifest a tendency to follow the lines of most 
direct ocean communication between the warmest and the cold- 
est portions of the globe, the general declination being westerly 
in the Atlantic, and easterly in the Pacific Ocean. 
2. The lines of no variation are apparently determined in part 
by the land contours that divide the waters of the globe into 
two great bodies. 
3. The currents are deflected by the southern pointed extremi- — 
ties of the several continents toward the east on the eastern 
shores, and toward the west on the western shores, of New Hol- 
the “ Lines of equal 
hich was from Evans's EB 
States Coast Survey Report of 1859, and No. z 
ascertaining and applying the deviations of 
