The extreme purity of the black waters is confirmed by their transparency, and by the way they clearly reflect all the surrounding objects. The minutest fish are visible at a depth of 20 or 30 feet. It is easy to see the river bottom, which is not muddy but composed of a dazzlingly white granite or quartz sand. Nothing can be compared to the beauty of the Atabapo river banks, overloaded with vegetation, among which rise the palms with plumed leaves, reflected in the river water. The green of the reflected image seems as real as the object seen with your eyes.

We had a tiring and dangerous climb up a bald granite hill. It would have been impossible to have kept our balance on the steep slippery surface of the rock had it not been for large feldspar crystals that stuck out and supported us. At the summit we were amazed at the extraordinary panorama. An archipelago of islands covered with palm trees filled the foamy river bed. The setting sun seemed like a ball of fire hanging over the plain. Birds of prey and goatsuckers flew out of reach above us. It was a pleasure to follow their shadows over the wall of rocks.

A few minutes before the first shock there was a violent gust of wind, accompanied by flashes of lightning and large raindrops. The sky remained covered; after the storm the wind died down, staying quiet all night. The sunset was extraordinarily beautiful. The thick veil of clouds tore open into strips just above the horizon, forming shreds, and the sun shone at 12 degrees of altitude against an indigo-blue sky. Its disc appeared incredibly swollen, distorted and wavy at its edges. The clouds were gilded, and clusters of rays colored like the rainbow spread in every direction from its center. A great crowd had congregated in the main square. This phenomenon, the accompanying earthquake, thunder rolling as the earth shook, and that reddish mist lasting so many days were blamed on the eclipse.

May 10th. Overnight our canoe was loaded and we set off a little before dawn to go up the Río Negro to the mouth of the Casiquiare and begin our researches on the true course of this river linking the Orinoco and Amazon. The morning was beautiful, but as the heat rose the sky began to cloud over. The air is so saturated with water in these forests that water bubbles become visible at the slightest increase of evaporation on the earth's surface. As there is no breeze the humid strata are not replaced and renewed by drier air. This clouded sky made us gloomier and gloomier. Through this humidity Bonpland -lost the plants he had collected; for my part I feared finding the same Río Negro mists in the Casiquiare valley. For more than half a century nobody in the missions has doubted the existence of communications between the two great river systems: the important aim of our journey was reduced to fixing the course of the Casiquiare by astronomic means, especially at its point of entry into the Río Negro, and its bifurcation with the Orinoco. Without sun or stars this aim would have been frustrated, and we would have been uselessly exposed to long, weary deprivation. Our travelling companions wanted to return by the shortest journey, along the Pimichín and its small rivers; but Bonpland preferred, like myself, to persist in the original plan we had traced out while crossing the Great Cataracts. We had already traveled by canoe from San Fernando de Apure to San Carlos along the Apure, Orinoco, Atabapo, Temi, Tuamini and Río Negro for over 180 leagues. In entering the Orinoco by the Casiquiare we still had some 320 leagues to cover from San Carlos to Angostura. It would have been a shame to let ourselves be discouraged by the fear of a cloudy sky and the Casiquiare mosquitoes. Our Indian pilot, who had recently visited Mandavaca, promised us sun and 'those great stars that eat up clouds' once we had left the black waters of the Guaviare. So we managed to carry out our first plan and returned to San Fernando along the Casiquiare. Luckily for our researches the Indian's prediction was fulfilled. The white waters brought us a clear sky, stars, mosquitoes and crocodiles.

The harbors of Ferrol and La Coruña both communicate with the samebay, so a ship driven by foul weather towards the coast may anchor ineither, according to the wind. Such an advantage is invaluable where thesea is almost always rough, as it is between Capes Ortegal and Finisterre, the promontories Trileucum and Artabrumof ancient geography. A narrow passage, flanked by perpendicular graniterocks, leads to the extensive bay of Ferrol. No port in Europe offers suchan extraordinary anchorage, from its very inland position. The narrow and tortuous passage by which vesselsenter this port has been opened, either by the pounding of waves or thereiterated shocks of very violent earthquakes. In the New World, on thecoasts of New Andalusia, the Lagunadel Obispo is formed exactly like the port of Ferrol. The most curiousgeological phenomena are often repeated at immense distances on the surfaceof different continents; and naturalists who have examined different partsof the globe are struck by the extreme resemblances observed in the fracturing of coasts, in the sinuositiesof the valleys, in the appearance of mountains, and in their distributionby groups. The accidental concurrence of the same causes must everywherehave produced the same effects; and amidst the variety of nature an analogy of structure and form is observedin the arrangement of inanimate matter, as well as in the internalorganization of plants and animals.