Although The Humid And Equable
Climate Of Chiloe, And Of The Coast Northward And Southward
Of It, Is So Unfavourable To Our Fruits, Yet The Native
Forests, From Lat.
45 to 38 degs., almost rival in luxuriance
those of the glowing intertropical regions.
Stately trees of
many kinds, with smooth and highly coloured barks, are loaded
by parasitical monocotyledonous plants; large and elegant
ferns are numerous, and arborescent grasses entwine the
trees into one entangled mass to the height of thirty or forty
feet above the ground. Palm-trees grow in lat 37 degs.; an
arborescent grass, very like a bamboo, in 40 degs.; and
another closely allied kind, of great length, but not erect,
flourishes even as far south as 45 degs. S.
An equable climate, evidently due to the large area of sea
compared with the land, seems to extend over the greater
part of the southern hemisphere; and, as a consequence, the
vegetation partakes of a semi-tropical character. Tree-ferns
thrive luxuriantly in Van Diemen's Land (lat. 45 degs.), and I
measured one trunk no less than six feet in circumference.
An arborescent fern was found by Forster in New Zealand
in 46 degs., where orchideous plants are parasitical on the
trees. In the Auckland Islands, ferns, according to Dr.
Dieffenbach [10] have trunks so thick and high that they may
be almost called tree-ferns; and in these islands, and even
as far south as lat. 55 degs. in the Macquarrie Islands,
parrots abound.
On the Height of the Snow-line, and on the Descent of
the Glaciers in South America. - For the detailed authorities
for the following table, I must refer to the former edition: -
Height in feet
Latitude of Snow-line Observer
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Equatorial region; mean result 15,748 Humboldt.
Bolivia, lat. 16 to 18 degs. S. 17,000 Pentland.
Central Chile, lat. 33 degs. S. 14,500 - 15,000 Gillies, and
the Author.
Chiloe, lat. 41 to 43 degs. S. 6,000 Officers of the
Beagle and the
Author.
Tierra del Fuego, 54 degs. S. 3,500 - 4,000 King.
As the height of the plane of perpetual snow seems chiefly to
be determined by the extreme heat of the summer, rather than
by the mean temperature of the year, we ought not to be
surprised at its descent in the Strait of Magellan, where the
summer is so cool, to only 3500 or 4000 feet above the level of
the sea; although in Norway, we must travel to between lat. 67
and 70 degs. N., that is, about 14 degs. nearer the pole, to meet
with perpetual snow at this low level. The difference in height,
namely, about 9000 feet, between the snow-line on the Cordillera
behind Chiloe (with its highest points ranging from
only 5600 to 7500 feet) and in central Chile [11] (a distance of
only 9 degs. of latitude), is truly wonderful. The land from the
southward of Chiloe to near Concepcion (lat. 37 degs.) is hidden
by one dense forest dripping with moisture.
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