Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 3 - By Alexander Von Humboldt And Aime Bonpland.
- Page 271 of 332 - First - Home
In The Group Of The Parime, As Well As In The Group Of The
Mountains Of Central Asia, Between The
Himalaya and the Altai, the
partial chains are often interrupted and have no uniform parallelism.
Towards the south-west, however
(Between the strait of Baraguan, the
mouth of the Rio Zama and the Esmeralda), the line of the mountains is
generally in the direction of north 70 degrees west. Such is also the
position of a distant coast, that of Portuguese, French, Dutch and
English Guiana, from Cape North to the mouth of the Orinoco; such is
the mean direction of the course of the Rio Negro and Yupura. It is
desirable to fix our attention on the angles formed by the partial
chains, in different regions of America, with the meridians; because
on less extended surfaces, for instance in Germany, we find also this
singular co-existence of groups of neighbouring mountains following
laws of direction altogether different, though every separate group
exhibits the greatest uniformity in the line of chains.
The soil on which the mountains of Parime rise, is slightly convex. By
barometric measures I found that, between 3 and 4 degrees north
latitude, the plains are elevated from 160 to 180 toises above
sea-level. This height will appear considerable if we reflect that at
the foot of the Andes of Peru, at Tomependa, 900 leagues from the
coast of the Atlantic Ocean, the Llanos or plains of the Amazon rise
only to the height of 194 toises. The distinctive characteristics of
the group of the mountains of Parime are the rocks of granite and
gneiss-granite, the total absence of calcareous secondary formations,
and the shelves of bare rock (the tsy of the Chinese deserts), which
occupy immense spaces in the savannahs.
5. GROUP OF THE BRAZIL MOUNTAINS.
This group has hitherto been marked on the maps in a very erroneous
way. The temperate table-lands and real chains of 300 to 500 toises
high have been confounded with countries of exceedingly hot
temperature, and of which the undulating surface presents only ranges
of hills variously grouped. But the observations of scientific
travellers have recently thrown great light on the orography of
Portuguese America. The mountainous region of Brazil, of which the
mean height rises at least to 400 toises, is comprehended within very
narrow limits, nearly between 18 and 28 degrees south latitude; it
does not appear to extend, between the provinces of Goyaz and
Matogrosso, beyond longitude 53 degrees west of the meridian of Paris.
When we regard in one view the eastern configuration of North and
South America, we perceive that the coast of Brazil and Guiana, from
Cape Saint Roque to the mouth of the Orinoco (stretching from
south-east to north-west), corresponds with that of Labrador, as the
coast from Cape Saint Roque to the Rio de la Plata corresponds with
that of the United States (stretching from south-west to north-east).
The chain of the Alleghenies is opposite to the latter coast, as the
principal Cordilleras of Brazil are nearly parallel to the shore of
the provinces of Porto Seguro, Rio Janeiro and Rio Grande.
Enter page number
PreviousNext
Page 271 of 332
Words from 142137 to 142664
of 174507