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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In These Three
Places The Thermometer Sometimes Keeps Up For Several Hours Between 0
And 4 Degrees (Centigrade); And Yet
(A circumstance which appears to
be very remarkable) snow has never been seen to fall; and
notwithstanding the great lowering
Of the temperature, the bananas and
the palm-trees are as beautiful around Canton, Macao and the Havannah
as in the plains nearest the equator.
In the island of Cuba the lowering of the temperature lasts only
during intervals of such short duration that in general neither the
banana, the sugar-cane nor other productions of the torrid zone suffer
much. We know how well plants of vigorous organization resist
temporary cold, and that the orange trees of Genoa survive the fall of
snow and endure cold which does not more than exceed 6 or 7 degrees
below freezing-point. As the vegetation of the island of Cuba bears
the character of the vegetation of the regions near the equator, we
are surprised to find even in the plains a vegetable form of the
temperate climates and mountains of the equatorial part of Mexico. I
have often directed the attention of botanists to this extraordinary
phenomenon in the geography of plants. The pine (Pinus occidentalis)
is not found in the Lesser Antilles; not even in Jamaica (between 17
3/4 and 18 1/2 degrees of latitude). It is only seen further north, in
the mountains of San Domingo, and in all that part of the island of
Cuba situated between 20 and 23 degrees of latitude. It attains a
height of from sixty to seventy feet; and it is remarkable that the
cahoba* (mahogany (* Swieteinia Mahogani, Linn.)) and the pine
vegetate at the island of Pinos in the same plains. We also find pines
in the south-eastern part of the island of Cuba, on the declivity of
the Copper Mountains where the soil is barren and sandy. The interior
table-land of Mexico is covered with the same species of coniferous
plants; at least the specimens brought by M. Bonpland and myself from
Acaguisotla, Nevado de Toluca and Cofre de Perote do not appear to
differ specifically from the Pinus occidentalis of the West India
Islands described by Schwartz. Now those pines which we see at sea
level in the island of Cuba, in 20 and 22 degrees of latitude, and
which belong only to the southern part of that island, do not descend
on the Mexican continent between the parallels of 17 1/2 and 19 1/2
degrees, below the elevation of 500 toises. I even observed that, on
the road from Perote to Xalapa in the eastern mountains opposite to
the island of Cuba, the limit of the pines is 935 toises; while in the
western mountains, between Chilpanzingo and Acapulco, near
Quasiniquilapa, two degrees further south, it is 580 toises and
perhaps on some points 450. These anomalies of stations are very rare
in the torrid zone and are probably less connected with the
temperature than with the nature of the soil.
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