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.

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