( 570 > 
European North Pole (which in No. 148. I fuppofed 
near the Meridian of the Lands End of England, and 
about feven degrees therefrom) is that that is moveable 
of the two Northern Poles, and that that has chiefly 
influenced the Variations in thefe parts of the World : 
For in Hudfori* Bay, which is under the Direftion of the 
American Pole^the change is not obferved to be near fo 
f aft as in thefe parts of Europe, tho that Pole be much 
farther removed from the Axis. 
As to the South Poles, I take the Afian Pole, which I 
place about the Meridian of thelfland Celebes to be the 
fixt, and confequently the American Pole to move 5 
from the like oblervation of the flow decreafe of the 
Variation on the Coaft of Java, and near the Meridian 
of the Afian Pole 3 tho I muft confefs to have no ac- 
count ot the effefts of the other beyond Magellan's 
Streights: 
If this be allowed me, 'tis plain that the fixt Poles are 
the Poles of this External Shell or Cortex of the Earth, 
and the other two the Poles of a Magnetical Nucleus 
included and moveable within the other, It likewife 
follows, that this Motion is Weft wards, and by confe- 
quence that the aforefaid Nucleus has not precilely at- 
tained the fame degree of Velocity with the exteriour 
parts in their Diurnal Revolution : but fo very nearly 
equals it that in }6$ Revolves the difference is fcarce 
fenfible. This I conceive to arife from the Impulfe 
whereby this diurnal Motion wasimprefton the Earth, 
being given to the external parts , and from thence in 
time communicated to the internal $ but not fo as per- 
fe&ly to equal the Velocity of the firft Motion impref- 
fed on,and ftiil conferved by the fuperficial parts of the 
Globe. 
As to the Quantity of this Motion it is almoft impoP- 
fible to define it, both from the Nature of this kind of 
Obfervatien > which cannot be very accurately per- 
Jbraied 
