74 SEVENTH REPORT—1837. 
sphere. The observations by which this inference might be 
confirmed are few, but none give a contrary indication. Every 
observation in the South Pacific section shows that a higher 
intensity prevails there than in equal latitudes in the North 
Pacific section; and, as far as the lines can yet be traced from 
the observations, the inflection in the South Pacific does ap- 
pear to be the least marked in character, and to extend over 
the fewest meridians. It is of course the lines of higher in- 
tensity which would afford the more decisive evidence, because 
their characteristics are more marked; but the authorities for 
these are few in the part of the space between New Zealand 
and South America, where they could most illustrate the point 
in question. 
In review, we conclude, therefore, that, as far as observa- 
tions have yet been made in the southern hemisphere, they 
accord with a system analogous to that in the northern, of two - 
centres, of unequal force, and at unequal distances apart. The 
observations further render it probable, that the distances be- 
tween the centres are still more unequal in the southern than 
in the northern hemisphere. Admitting the small difference 
of distribution from this cause, there does not appear reason 
to suppose that there is any general inequality in the magnetic 
charge of the two hemispheres ; on the contrary, there is every 
appearance that they have the same. 
6. If the globe be divided into an eastern and a western 
hemisphere by a plane, coinciding with the meridians of 100° 
and 280°, the western hemisphere, or that comprising the 
Americas and the Pacific Ocean, has a much higher mag- 
netic intensity distributed generally over its surface, than the 
eastern hemisphere, containing Europe and Africa and the 
adjacent part of the Atlantic Ocean. 
This is a corollary from (4) and (5) rather than a distinct 
proposition. The four centres being in the western hemisphere 
a higher intensity will prevail generally in its meridians; and 
this is accordant with the whole body of observations distri- 
buted over the globe (Plate V). 
The equality of the magnetic charge in the northern and 
southern hemispheres and its inequality in the eastern and 
western, are important features of the magnetic system mani- 
fested by the observations of intensity. 
%. The distribution of the intensity in the intertropical re- 
gions is accordant with the conclusions already drawn, of two 
governing centres in each hemisphere. 
As the lines of higher intensity are those which have the 
