e Quator n ‘ 
^.s**,**^ .* w t*. 
eifK U S R 1 force as at the n ? S ° ^ rca * a degree by the 
tbe q r , P ° 1<5 w °uld be nothin qua |: 0r » wilich force indeed at 
„ r ' 1 on the surface of n ^ tonce the temperature of 
fenlT \ haa at tt e° q f u ^ r ear ;t at the P o1 - would be 
. ni5l We heat to lnmi , ,,r ' This air will impart its 
>t flows ai ong toward fc’f ia * hos< ’ v «*><'■“. »»« L 
goes its sensible heat if „ ? a ” d north > yielding up &s 
H*:°Z SbM^pT,- 
,be temperature is'funhcrToduce/bv “he* 11 ' 6 air flows on 
at -which the cold win k oeita - r ! dis'anco from either pole 
reaches thoL ^bul^^reanh^ t '* 1 *“■ *** 
the influence of 0 ® art h that are more under 
dnallw t • . 0 6UD > an d its temperature begins era- 
illy to rise, m consequence of receiving heat from the 
warmer objects on tbe earth; thus the flimate becomes 
warmer and warmer, until again we arrive at thelorrid 
hv D T)',. £ US f aPP ° arS tha ‘ the 0pen P° lar discovered 
y i>x. avane is a consequence of natural laws governing 
the circulation of air around the globe; and not only the 
existence of water free from ice in the polar regions might 
have been foreseen, but that there exists at both poles 
of the earth a mild and perhaps a pleasant climate. Pos¬ 
sibly some future explorers will find there new continents 
inhabited by men. 
The air moving towards the poles from the equator 
will have the same, or nearly the same, velocity parallel 
to the equator that the earth has at the equatcr; for it 
would* seem that there is no force in the high regions of 
the atmosphere to check its motion or change its direc¬ 
tion ; but it has a certain velocity also in the direction of 
the poles. The resultant of these forces will be in a north¬ 
easterly and southeasterly direction. At the poles the 
air also obeys the force of gravity, which draws it down¬ 
wards, thus producing a spiral wind towards the earth, 
modified, it may be, by obstacles with which it may meet, 
as mountains, hills, forests, &c. 
It may be objected to this theory that if the air is so 
warm at the poles, even warmer than at the equator, why 
does it not rise there as well as at the equator ? To this 
objection it may be answered that the same cause that 
brings it down will keep it from rising, viz. to supply the 
vacuum that would otherwise be left by the flow of air 
from the poles towards the equator. Another reason is 
that it becomes cooled as soon as it reaches the surface 
of tbe earth by imparting its beat to the land and water, 
and being then colder and more dense than the air above 
lt according to the laws of pneumatics it o»nnot rise, but 
wiU flow north and south after the air that flows into the 
Torrid zones. This accounts for the comparatively warm 
wind which Dr. Kane observed to blow from the north 
0 , The h wa?m n temp'ratare existing in tbe region! of the 
rnfrs cannot be explained by supposing the earth there to 
he heated by internal fires, for In this case there could be 
be he ate y towards the north and south, 
n0 wind fromjhe P®^ fche 8urface> would rise up 
since >he equator, and there would be a wind bio w- 
as it does at t the icy regions. This is not 
ing towards th.-. P ^ faotB obgerve d. All the facte made 
inaccordao 1 g ane that have come to the knowledge of 
known b} 1 con fi rm atory of the theorem above ex- 
the writer '* re 
plained. 
