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. N.) under which
Pallas found the frozen rhinoceros in Siberia, is very
interesting. Although it is a fallacy, as I have endeavoured to
show in a former chapter, to suppose that the larger quadrupeds
require a luxuriant vegetation for their support, nevertheless
it is important to find in the South Shetland Islands
a frozen under-soil within 360 miles of the forest-clad islands
near Cape Horn, where, as far as the _bulk_ of vegetation is
concerned, any number of great quadrupeds might be supported.
The perfect preservation of the carcasses of the
Siberian elephants and rhinoceroses is certainly one of the
most wonderful facts in geology; but independently of the
imagined difficulty of supplying them with food from the
adjoining countries, the whole case is not, I think, so
perplexing as it has generally been considered. The plains of
Siberia, like those of the Pampas, appear to have been formed
under the sea, into which rivers brought down the bodies
of many animals; of the greater number of these, only the
skeletons have been preserved, but of others the perfect
carcass.
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