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If we may be allowed to judge of the structure of the whole Sierra Parime, from the part which I examined in 6 degrees of longitude, and 4 degrees of latitude, we may believe it to be entirely composed of gneiss-granite; I saw some beds of greenstone and amphibolic slate, but neither mica-slate, clay-slate, nor banks of green limestone, although many phenomena render the presence of mica-slate probable on the east of the Maypures and in the chain of Pacaraina.
At Maypures and Atures, locks on doors are unknown: they will be introduced only when whites and men of mixed race establish themselves in the missions. The Indians of Atures are mild and moderate, and accustomed, from the effects of their idleness, to the greatest privations. Formerly, being excited to labour by the Jesuits, they did not want for food.
Black bands seem to indicate, that the highest swellings of the Orinoco do not rise at this place above eight feet; and that the great swellings observed lower down are owing to the tributary streams which flow into it north of the raudales of Atures and Maypures. We passed the night on the right bank opposite the mouth of the Rio Siucurivapu, near a rock called Aricagua.
The fruit is a pod, filled with winged seeds, and is two feet long. This plant grows spontaneously, and in great abundance, near Maypures; and in going up the Orinoco, beyond the mouth of the Guaviare, from Santa Barbara to the lofty mountain of Duida, particularly near Esmeralda. We also found it on the banks of the Cassiquiare.
In the huts of the natives of Maypures we found an appearance of order and neatness, rarely met with in the houses of the missionaries. These natives cultivate plantains and cassava, but no maize. Cassava, made into thin cakes, is the bread of the country.
The boats are entrusted to the natives, who have so perfect a knowledge of the raudal, that they have a particular name for every step. They conduct the boats as far as the mouth of the Cameji, where the danger is considered as past. I will here describe the cataract of Quituna or Maypures as it appeared at the two periods when I examined it, in going down and up the river.
At my return from Mexico in 1807, when I showed the granites of Atures and Maypures to M. Roziere, who had travelled over the valley of Egypt, the coasts of the Red Sea, and Mount Sinai, this learned geologist pointed out to me that the primitive rocks of the little cataracts of Syene display, like the rocks of the Orinoco, a glossy surface, of a blackish-grey, or almost leaden colour, and of which some of the fragments seem coated with tar.
The missionary had justly observed, that the insects abounded more particularly in the lowest strata of the atmosphere, that which reaches from the ground to the height of twelve or fifteen feet. At Maypures the Indians quit the village at night, to go and sleep on the little islets in the midst of the cataracts. There they enjoy some rest; the mosquitoes appearing to shun air loaded with vapours.
It is an unquestionable fact that at Carichana, at San Borja, at Atures, and at Maypures, wherever the river has forced its way through the mountains, you see at a hundred, sometimes at a hundred and thirty feet, above the highest present swell of the river, black bands and erosions, that indicate the ancient levels of the waters.
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