(219; 
^his Wejterly Variation ceafcs , and an Eafterly begins 5 
\yhich reaches according to my Hypothefis to the middle 
^ix)^^ South St^htiv^^m Z^ela7idia Nova ^x\i. Chili ^ leaving 
room for d^imiXXWejl-VaYiation go^vtmtii by the American 
South Pole-, which I fliewcdto be in x\itFacifich^Sea^ m 
the Sixth and Seventh reinaik. 
What I have now faid , does plainly ^fhew the fuffici-- 
encie of this Hypothefis for folving the Variations that are 
* at this time obferved in the temperate and frigid Z^nes^ 
where the diredion of the Needle chiefly depends upon the 
Counterpoife of the forces of two Magnetical Poles of 
the fame nature ; and I fuppofe I have flietvn how it comes 
to pafs, that under the fame Meridian the Variation (hould 
be in one place 29 Weft , and in another 20 \ Eaji 5 as I 
noted in my ninth remarque. 
In the Torrid 2^ne , and particularly under the Equi-- 
noftialj refped muft be had to allfour Poles ^ and their 
pofitionswell confidered^ other wife it will notbeeafyio 
determine what the Variations fhall be ; the neareft Pole 
being always the ftrongeft^ yet not fo, as not to be 
counterballanced fometimes by the united forces of two 
more remote; a notable inftance whereof is in our 8th re- 
mark, where I took notice * that in failing from St.He- 
knahy the Ifle of u^fcenfon^ to the Equator, on a N^.courfe 
the Variation is very little Eafterly and in that whole Traft 
unalterable, for which I give this realon 5 that the South 
American Pole (w^hich is confiderably the neareft in the 
aforefaid places>) requiring a great Eafterly variation is 
counterpoized by the contrary attraftion of thcNorth-ji" 
mericamviix\i^ Jjian-Sout/jVolt ; each whereof fingly are* 
in thele parts, weaker than the American Southp6le\ and 
upon the iV^.courfe, thediftance from this latter is very 
little varied and as you recede from the AJian'South--^'po\Q^ 
the ballance is Hill preferved by the accefs towards the 
North" Amermn-?oU'. I mention not in this cafe the Eu- 
