demonstrate : and that it is returned to, 
and emitted from the sun, though more 
indirectly than to the outer surface of the 
earth, is highly probable. 
The theory on which I predicate mv se- j 
cond evidence of -the truth of your posi-1 
tions, being perhaps as new as your own 
theory, will no doubt meet with its oppo- 1 
nents and scoffers. It is simply this : that 
it is cold which gives polarity to the needle 
-that what has been styled the magnetic 
fluid?’ is nothing more than a consequence 
ot heat being in a latent state in the polar 
regions, and by the affinity which one bo¬ 
dy has for another, the point of the needle 
is attracted in that direction. Were the 
earth closed at the poles, of course the 
greatest degree of cold would be under 
he pole itself, or in the centre of the arc- i 
tic region; consequently the needle would 
never vary. This we do not find to be the 
case: but we find that vessels going very 
far north, have their needles to turn near¬ 
ly east or west, according to which side a 
continent lies (which is always colder than : 
the ocean) and that the dip of the needle is 
in proportion to the distance yon are north 
or south. From this, I would infer, that 
the greatest degree of cold is at the icy 
ring Which surrounds the orifice of the 
pole, and which lies, perhaps,in the 34th d. 
The poles ot the inner globes, must par¬ 
take ot nearly, if not quite, an equal de¬ 
gree of cold, and by their movements on 
their axis must contribute to the phenorn- j 
euou ot magnetic variation. That cold is 
(because of the polarity of the needle, I 
could adduce one hundred convincing 
proofs, though foreign to the subject of the 
present letter; but the variation of the 
compass can be accounted for in no other 
manner than from a polar orifice, and in¬ 
ner globe. 
That the author of nature should have 
created such an immense mass as the in¬ 
ner part of our globe, to be destitute of an¬ 
imal life, is very contrary to what we ob¬ 
serve on the surface. But how are we to 
approach the Elysian Fields of the inner 
regions: Following the track of the rein 
4eei through the deserts of Siberia, ap¬ 
peal & a Herculean undertaking* besides, 
!' 1 ! na P be corr ect, it is bounded on the 
r-vi i-l ^ ocean * ^ I mistake not, we 
" ach the highest latitude in the neigh- 
