On the evening of the 18th of May we reached a place on the bank where wild cacao trees grew. The seed of these cacao trees is small and bitter; the Indians suck the pulp and throw away the seed, which is then picked up by mission Indians who sell it to those who are not too fussy about how to prepare cocoa. 'This is Puerto del Cacao (Cacao Port)', said our pilot. 'Here the Fathers sleep on their way to Esmeralda to buy Saracens (blowpipes to shoot poison arrows) and jovial (Brazil-nuts). Only five boats a year pass along the Casiquiare. Since Maypures, that is, for a month, we had not met anyone on the rivers outside the missions. We spent the night south of Lake Duractumuni in a forest of palm trees. It poured with rain, but the pothoses, arums and lianas made such a thick trellis that we sheltered underneath.

The farmers and their slaves cut a path through the jungle to the first Juagua river waterfall, and on the 10th of September we made our excursion to the Cuchivano crevice. Entering the cave we saw a disemboweled porcupine and smelled the stink of excrement, similar to that of European cats, and knew that a jaguar had been near by. For safety the Indians returned to the farm to fetch small dogs. It is said that when you meet a jaguar in your path he will leap on to a dog before a man. We did not follow the bank of the torrent, but a rocky wall overhanging the water. We walked on a very narrow ledge along the side of a precipice with a drop of some 200 to 300 feet. When it narrowed, so that we could not walk along it any further, we climbed down to the torrent and crossed it on foot, or on the backs of slaves, to climb up the other side. Climbing is very tiring, and you cannot trust the lianas, which, like thick rope, hang from tree-tops. Creepers and parasites hang loosely from the branches they grip; their stalks together weigh a lot, and if you slip and grab one of the lianas you risk bringing down a tangle of green branches. The vegetation became impenetrable the more we advanced. In some places the roots of trees grew in the existing cracks between strata and had burst the calcareous rock. We could hardly carry the plants we picked at each step. The canna, the heliconia with pretty purple flowers, the costus and other plants from the Amomum genus reach here the height of 8 to 50 feet. Their tender, fresh green leaves, their silky sheen and the extraordinary development of their juicy pulp contrast with the brown of the arborescent ferns whose leaves are so delicately jagged. The Indians made deep incisions in the tree trunks with their long knives to draw our attention to the beauty of the red-and gold-colored woods, which one day will be sought after by our furniture makers. They showed us a plant with composite flowers that reaches some 20 feet high (Eupatorium laevigatum), the so-called 'Rose of Belveria' (Brownea racemosa), famous for the brilliance of its purple flowers, and the local 'dragon's blood', a species of euphorbia not yet catalogued, whose red and astringent sap is used to strengthen the gums. They distinguished species by their smell and by chewing their woody fibers. Two Indians, given the same wood to chew, pronounced, often without hesitation, the same name. But we could not take advantage of our guides' wisdom, for how could they reach leaves, flowers and fruit (53) growing on branches some 50 to 60 feet above the ground? We were struck in this gorge by the fact that the bark of the trees, even the ground, were covered in moss and lichen.

A journey to the Tenerife volcano's summit is not solely interesting for the amount of phenomena available for scientific research but far more for the picturesque beauties offered to those who keenly feel the splendors of nature. It is a hard task to describe these sensations for they work on us so much more powerfully the more they are vague. When a traveler must describe the highest peaks, the river cataracts, the tortuous Andes valleys, he risks tiring his readers with the monotonous expression of his admiration. It seems better suited to my intentions in this narrative of my journey to evoke the particular character of each zone. We get to know the features of each region better the more we indicate its varying characteristics by comparing it with others. This method enables us to discover the sources of the pleasures conferred by the great picture of nature.

We were forced to cut our own track across the malpaís. The slope is very steep, and the volcanic blocks slipped under our feet. The rubble on the peak's summit has sharp edges and leaves gaps into which explorers risk falling up to their waists. Unfortunately the laziness and bad temper of our guides made this ascent more difficult. They were despairingly phlegmatic. The night before they had tried to convince us not to pass beyond the limit of the rocks. Every ten minutes they would sit down to rest; they threw away pieces of obsidian and pumice-stone that we had carefully collected. Finally we realized that none of them had ever visited the volcano's summit before.