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. The sky is
cloudy, and we have seen how badly the fruits of southern
Europe succeed. In central Chile, on the other hand, a little
northward of Concepcion, the sky is generally clear, rain does
not fall for the seven summer months, and southern European
fruits succeed admirably; and even the sugar-cane has
been cultivated. [12] No doubt the plane of perpetual snow
undergoes the above remarkable flexure of 9000 feet,
unparalleled in other parts of the world, not far from the
latitude of Concepcion, where the land ceases to be covered
with forest-trees; for trees in South America indicate a rainy
climate, and rain a clouded sky and little heat in summer.
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