Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 3 - By Alexander Von Humboldt And Aime Bonpland.
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The Same Survey
Has Made Known The Minimum Of Height At Chile Of The Lower Limit Of
Snow, In 33 Degrees South Latitude.
The limit does not lower in summer
to 2000 toises.* (* On the southern declivity of the Himalayas snow
begins
(3 degrees nearer the equator) at 1970 toises.) I think we may
conclude according to the analogy of the Snowy Mountains of Mexico and
southern Europe, and considering the difference of the summer
temperature of the two hemispheres, that the real Nevadas at Chile, in
the parallel of Valdivia (latitude 40 degrees), cannot be below 1300
toises; in Valparaiso (latitude 33 degrees) not lower than 2000
toises, and in that of Copiapo (latitude 27 degrees) not below 2200
toises of height. These are the limit-numbers, the minimum of
elevation, which the ridge of the Andes of Chile must attain in
different degrees of latitude, to enable their summits to rise above
the line of perpetual snow. The numerical results which I have just
marked and which are founded on the laws of distribution of heat, have
still the same importance which they possessed at the time of my
travels in America; for there does not exist in the immense extent of
the Andes, from 8 degrees south latitude to the Straits of Magellan,
one Nevada of which the height above the sea-level has been
determined, either by a simple geometric measure, or by the combined
means of barometric and geodesic measurements.
Between 33 and 18 degrees south latitude, between the parallels of
Valparaiso and Arica, the Andes present towards the east three
remarkable spurs, the Sierra de Cordova, the Sierra de Salta, and the
Nevados de Cochabamba.
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