I Here Name The Two Chains Of Mountains Running From East To West, And Bordering The Plains Or Basins Of

The Cassiquiare, the Rio Negro, and the Amazon, between 5 degrees 30 minutes north, and 14 degrees south latitude.) or

Have these walls of rock, these turrets of granite, been upheaved by the elastic forces that still act in the interior of our planet? We may be permitted to meditate a little on the origin of mountains, after having seen the position of the Mexican volcanoes, and of trachyte summits on an elongated crevice; having found in the Andes of South America primitive and volcanic rocks in a straight line in the same chain; and when we recollect the island, three miles in circumference, and of a great height, which in modern times issued from the depths of the ocean near Oonalaska.

The banks of the Cassiquiare are adorned with the chiriva palm-tree with pinnate leaves, silvery on the under part. The rest of the forest furnishes only trees with large, coriaceous, glossy leaves, that have plain edges. This peculiar physiognomy* of the vegetation of the Guainia, the Tuamini, and the Cassiquiare, is owing to the preponderance of the families of the guttiferae, the sapotae, and the laurineae, in the equatorial regions. (* This physiognomy struck us forcibly, in the vast forests of Spanish Guiana, only between the second and third degrees of north latitude.) The serenity of the sky promising us a fine night, we resolved, at five in the evening, to rest near the Piedra de Culimacari, a solitary granite rock, like all those which I have described between the Atabapo and the Cassiquiare. We found by the bearings of the sinuosities of the river, that this rock is nearly in the latitude of the mission of San Francisco Solano. In those desert countries, where man has hitherto left only fugitive traces of his existence, I constantly endeavoured to make my observations near the mouth of a river, or at the foot of a rock distinguishable by its form. Such points only as are immutable by their nature can serve for the basis of geographical maps. I obtained, in the night of the 10th of May, a good observation of latitude by alpha of the Southern Cross; the longitude was determined, but with less precision, by the chronometer, taking the altitudes of the two beautiful stars which shine in the feet of the Centaur. This observation made known to us at the same time, with sufficient precision for the purposes of geography, the positions of the mouth of the Pacimoni, of the fortress of San Carlos, and of the junction of the Cassiquiare with the Rio Negro. The rock of Culimacari is precisely in latitude 2 degrees 0 minutes 42 seconds, and probably in longitude 69 degrees 33 minutes 50 seconds.

Satisfied with our observations, we left the rock of Culimacari at half past one on the morning of the 12th. The torment of mosquitos, to which we were exposed, augmented in proportion as we withdrew from the Rio Negro. There are no zancudos in the valley of Cassiquiare, but the simulia, and all the other insects of the tipulary family, are the more numerous and venomous. Having still eight nights to pass in the open air in this damp and unhealthy climate, before we could reach the mission of Esmeralda, our pilot sought to arrange our passage in such a manner as might enable us to enjoy the hospitality of the missionary of Mandavaca, and some shelter in the village of Vasiva. We went up with difficulty against the current, which was nine feet, and in some places (where I measured it with precision) eleven feet eight inches in a second, that is, almost eight miles an hour. Our resting-place was probably not farther than three leagues in a right line from the mission of Mandavaca; yet, though we had no reason to complain of inactivity on the part of our rowers, we were fourteen hours in making this short passage.

Towards sunrise we passed the mouth of the Rio Pacimoni, a river which I mentioned when speaking of the trade in sarsaparilla, and which (by means of the Baria) intertwines in so remarkable a way with the Cababuri. The Pacimoni rises in a hilly ground, from the confluence of three small rivers,* not marked on the maps of the missionaries. (* The Rios Guajavaca, Moreje, and Cachevaynery.) Its waters are black, but less so than those of the lake of Vasiva, which also communicates with the Cassiquiare. Between those two tributary streams coming from the east, lies the mouth of the Rio Idapa, the waters of which are white. I shall not recur again to the difficulty of explaining this coexistence of rivers differently coloured, within a small extent of territory, but shall merely observe, that at the mouth of the Pacimoni, and on the borders of the lake Vasiva, we were again struck with the purity and extreme transparency of the brown waters. Ancient Arabian travellers have observed, that the Alpine branch of the Nile, which joins the Bahr el Abiad near Halfaja, has green waters, which are so transparent, that the fish may be seen at the bottom of the river.

We passed some turbulent rapids before we reached the mission of Mandavaca. The village, which bears also the name of Quirabuena, contains only sixty natives. The state of the Christian settlements is in general so miserable that, in the whole course of the Cassiquiare, on a length of fifty leagues, not two hundred inhabitants are found. The banks of this river were indeed more peopled before the arrival of the missionaries; the Indians have withdrawn into the woods, toward the east; for the western plains are almost deserted. The natives subsist during a part of the year on those large ants of which I have spoken above. These insects are much esteemed here, as spiders are in the southern hemisphere, where the savages of Australia deem them delicious.

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