This Protects The Young Plants From Weeds, Worms, And Those Ants Which Pursue Their Migration In A Right Line, And, Not Knowing What Vegetates Above Them, Seldom Turn From Their Course To Climb Up Stakes That Are Stripped Of Their Bark.

I mention this circumstance to prove how difficult, within the tropics, on the banks of great rivers, are the first attempts of man to appropriate to himself a little spot of earth in that vast domain of nature, invaded by animals, and covered by spontaneous plants.

During the night of the 13th of May, I obtained some observations of the stars, unfortunately the last at the Cassiquiare. The latitude of Mandavaca is 2 degrees 4 minutes 7 seconds; its longitude, according to the chronometer, 69 degrees 27 minutes. I found the magnetic dip 25.25 degrees (cent div), showing that it had increased considerably from the fort of San Carlos. Yet the surrounding rocks are of the same granite, mixed with a little hornblende, which we had found at Javita, and which assumes a syenitic aspect. We left Mandavaca at half-past two in the morning. After six hours' voyage, we passed on the east the mouth of the Idapa, or Siapa, which rises on the mountain of Uuturan, and furnishes near its sources a portage to the Rio Mavaca, one of the tributary streams of the Orinoco. This river has white waters, and is not more than half as broad as the Pacimoni, the waters of which are black. Its upper course has been strangely misrepresented on maps. I shall have occasion hereafter to mention the hypotheses that have given rise to these errors, in speaking of the source of the Orinoco.

We stopped near the raudal of Cunuri. The noise of the little cataract augmented sensibly during the night, and our Indians asserted that it was a certain presage of rain. I recollected that the mountaineers of the Alps have great confidence in the same prognostic.* (* "It is going to rain, because we hear the murmur of the torrents nearer," say the mountaineers of the Alps, like those of the Andes. The cause of the phenomenon is a modification of the atmosphere, which has an influence at once on the sonorous and on the luminous undulations. The prognostic drawn from the increase and the intensity of sound is intimately connected with the prognostic drawn from a less extinction of light. The mountaineers predict a change of weather, when, the air being calm, the Alps covered with perpetual snow seem on a sudden to be nearer the observer, and their outlines are marked with great distinctness on the azure sky. What is it that causes the want of homogeneity in the vertical strata of the atmosphere to disappear instantaneously?) It fell before sunrise, and the araguato monkeys had warned us, by their lengthened howlings, of the approaching rain, long before the noise of the cataract increased.

On the 14th, the mosquitos, and especially the ants, drove us from the shore before two in the morning.

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