It is H well known fact, that refraction is 
est towards the poles of the earth, owing' prob¬ 
ably to the dense atmosphere there. The appa¬ 
rent continuation of the margin of his true disc 
through these ring's, (if not an imaginary lute 
dotted there,) must be the farther verge ol the 
second sphere within, rising by refraction, ap¬ 
parently as far out as the true periphery of his 
disc. 
j contend that the space within the circum¬ 
ference of the arctic icy circle, if not hollow, 
ol - greatly concave, could scarce afford space 
and surface to maintain alive, and in health, all 
the fish known to come from thence annually, 
in the spring', even if, (without resorting to 
feeding on each other,) their food was inex¬ 
haustible, and the whole circle water. But float¬ 
ing trees being often found far north of where 
we seear.y grow, is an impressive circumstance 
to show it cannot all be water; and the fact that 
these trees are generally such as abound in the: 
tropics, (together with several unknown spe- 1 
#ies,} shews,tfcat there is a hut climate beyond;! 
,and the migration of the rein deer, too, shows 
that moss or other vegetables abound there, 
and consequently land. 
Pinkerton states, that the Dutch, who at dif¬ 
ferent times got detained by the ice in high lat- 
| dudes, could find but few fish to eat in the sea¬ 
son of winter, which proves that the migrating 
v f. fish do not winter amongst or on thisside the ice. 
1 also refer to Dr. Darwin’s notes on winds, 
in his Botanic Garden, (which 1 never read un~ 
i tii after I adopted my theory,) where that great, 
although often extravagant philosopher, decla¬ 
red his belief that there was a great secret, yet 
[to be explained, at the poles, and anticipated 
; that the light of the present age would disclose 
it. The stone spheroid he found hollow and 
j somewhat disposed in concentric strata, and 
the concentric iron nodules he describes, de¬ 
serve to be considered. -Fie states that the 
seeds of several tropical plants afe often found 
in the seas high north, in a state 30 recent as to 
vegetate. 
I recommend the perusal of Mavor’s and 
I Pinkerton’s Voyages; Pennant and Goldsmith 
on animated nature ; and Hearn’s and Macken¬ 
zie a travels—wherein many testa of my posi¬ 
tion exist. Pinkerton shows that, beyond lati¬ 
tude 75° the north winds are often warm irt 
I winter; that in mid-winter there fulls for seve¬ 
ral weeks, almost continued rain, and that ve- 
getables and game are more abundant at SO 0 
Ithan at 76. 
