April 30th. We continued upstream on the Atabapo for 5 miles, then instead of following this river to its source, where it is called the Atacavi, we entered the Temi river. Before reaching this tributary, near the Guasacavi mouth, a granite outcrop on the west bank fixed our attention: it is called the rock of the Guahiba Indian woman, or the Mother Rock, the Piedra de la Madre. Father Zea could not the explain its bizarre name, but a few weeks later another missionary told us a story that stirred up painful feelings. If, in these deserted places, man leaves hardly any traces behind him, it is doubly humiliating for a European to see in the name of a rock a memory of the moral degradation of whites that contrasts the virtue of a wild Indian with the barbarity of civilized men!

From the time we entered the torrid zone we never tired of admiring, night after night, the beauty of the southern sky, which as we advanced further south opened up new constellations. A strange, completely unknown feeling is awoken in us when nearing the Equator and crossing from one hemisphere to another; the stars we have known since infancy begin to vanish. Nothing strikes the traveler more completely about the immense distances that separate him from home than the look of a new sky. The grouping of great stars, some scattered nebulae that rival the Milky Way in splendor, and regions that stand out because of their intense blackness, give the southern sky its unique characteristics. This sight strikes the imagination of those who even, without knowledge of the exact sciences, like to stare at the heavens as if admiring a lovely country scene, or a majestic site. You do not have to be a botanist to recognize immediately the torrid zone by its vegetation. Even those with no inkling of astronomy know they are no longer in Europe when they see the enormous constellation of the Ship or the brilliant Clouds of Magellan rise in the night sky. Everything on earth and in the sky in the tropical countries takes on an exotic note.

The ground of the island rises to form an amphitheatre and, as in Peru and Mexico, contains in miniature all the possible climates, from African heat to alpine cold. (14) The mean temperatures of Santa Cruz, the port of Orotava, Orotava itself and La Laguna form a descending series. In southern Europe the change of seasons is too strongly felt to offer the same advantages. Tenerife on the other hand, on the threshold of the Tropics and a few days' journey from Spain, benefits from a good part of what nature has lavished in the Tropics. Its flora include the beautiful and imposing bananas and palms. He who is able to feel nature's beauty finds in this precious island a far more effective remedy than the climate. Nowhere else in the world seems more appropriate to dissipate melancholy and restore peace to troubled minds than Tenerife and Madeira. These effects are due not only to the magnificent situation and to the purity of air, but above all to the absence of slavery, which so deeply revolts us in all those places where Europeans have brought what they call their 'enlightenment and their 'commerce' to their colonies

It was half past four in the afternoon when we finished our observations. Satisfied with the success of our journey we forgot that there might be dangers descending steep slopes covered with a smooth, slippery grass in the dark. We did not arrive at the valley bottom until ten at night. We were exhausted and thirsty after walking for fifteen hours, practically without stopping. The soles of our feet were cut and torn by the rough, rocky soil and the hard, dry grass stalks, for we had been forced to pull our boots off as the ground was too slippery. We spent the night at the foot of La Silla. Our friends at Caracas had been able to follow us on the summit with binoculars. They liked hearing our account of the expedition but were not happy with the result of our measurements, for La Silla was not as high as the highest mountains in the Pyrenees.

Opposite Bermúdez's farm two spacious caves open out of Cuchivano's crevice. At times flames, which can be seen from great distances, burst out. They illuminate the surrounding mountains, and from the mark left on the rocks by these burning gases we could be tempted to believe they reach some 100 feet high. During the last violent Cumanà earthquake this phenomenon was accompanied by long, dull, underground noises.

The apparent proximity of the hamlets, vineyards and coastal gardens from the summit is increased by the surprising transparency of the air. Despite the great distance we could not only pick out the houses, the tree trunks and the sails on the vessels, but also the vivid coloring of the plain's rich vegetation. The Pico de Teide is not situated in the Tropics, but the dryness of the air, which rises continuously above the neighboring African plains and is rapidly blown over by the eastern winds, gives the atmosphere of the Canary Islands a transparency which not only surpasses that of the air around Naples and Sicily, but also of the air around Quito and Peru. This transparency may be one of the main reasons for the beauty of tropical scenery; it heightens the splendors of the vegetation's coloring, and contributes to the magical effects of its harmonies and contrasts. If the light tires the eyes during part of the day, the inhabitant of these southern regions has his compensation in a moral enjoyment, for a lucid clarity of mind corresponds to the surrounding transparency of the air.