[16]
On The Climate And Productions Of The Antarctic Islands.
- Considering The Rankness Of The Vegetation In Tierra Del
Fuego,
And on the coast northward of it, the condition of the
islands south and south-west of America is truly
Surprising.
Sandwich Land, in the latitude of the north part of Scotland,
was found by Cook, during the hottest month of the
year, "covered many fathoms thick with everlasting snow;"
and there seems to be scarcely any vegetation. Georgia, an
island 96 miles long and 10 broad, in the latitude of Yorkshire,
"in the very height of summer, is in a manner wholly
covered with frozen snow." It can boast only of moss, some
tufts of grass, and wild burnet; it has only one land-bird
(Anthus correndera), yet Iceland, which is 10 degs. nearer the
pole, has, according to Mackenzie, fifteen land-birds. The
South Shetland Islands, in the same latitude as the southern
half of Norway, possess only some lichens, moss, and a little
grass; and Lieut. Kendall [17] found the bay, in which he was
at anchor, beginning to freeze at a period corresponding with
our 8th of September. The soil here consists of ice and
volcanic ashes interstratified; and at a little depth beneath
the surface it must remain perpetually congealed, for Lieut.
Kendall found the body of a foreign sailor which had long
been buried, with the flesh and all the features perfectly
preserved. It is a singular fact, that on the two great
continents in the northern hemisphere (but not in the broken
land of Europe between them ), we have the zone of perpetually
frozen under-soil in a low latitude - namely, in 56 degs. in
North America at the depth of three feet, [18] and in 62 degs.
in Siberia at the depth of twelve to fifteen feet - as the
result of a directly opposite condition of things to those
of the southern hemisphere. On the northern continents, the
winter is rendered excessively cold by the radiation from a
large area of land into a clear sky, nor is it moderated by
the warmth-bringing currents of the sea; the short summer,
on the other hand, is hot. In the Southern Ocean the winter
is not so excessively cold, but the summer is far less hot,
for the clouded sky seldom allows the sun to warm the ocean,
itself a bad absorbent of heat: and hence the mean temperature
of the year, which regulates the zone of perpetually congealed
under-soil, is low. It is evident that a rank vegetation,
which does not so much require heat as it does protection
from intense cold, would approach much nearer to this zone
of perpetual congelation under the equable climate of the
southern hemisphere, than under the extreme climate of the
northern continents.
The case of the sailor's body perfectly preserved in the icy
soil of the South Shetland Islands (lat. 62 to 63 degs. S.), in a
rather lower latitude than that (lat. 64 degs.
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