We cannot question that the earth, when split open and shaken by shocks, sometimes emits gaseous substances into the atmosphere in places remote from active volcanoes. At Cumana, as we have already observed, flames and vapors mixed with sulphurous acid rise from the most arid soil. In other parts of the same province the earth throws up water and petroleum. At Riobamba, a muddy, inflammable mass, called moya, issues from crevices that close up again and pile up into hills. Seven leagues from Lisbon, near Colares, during the terrible earthquake of the 1st of November 1755, flames and a column of thick smoke rose up from the rock face of Alvidras and, according to some witnesses, from the depths of the sea. This smoke lasted several days and was thicker when the underground noises accompanied the strongest tremors.

However, this luxuriant vegetation does not only embellish the outer vault but also reaches into the vestibule of the grotto. We saw, to our surprise, that superb heliconias 18 feet tall, with banana-tree type leaves, praga palms and arborescent arums bordered the rivulet's banks right into the cave. Vegetation penetrates inside the Caripe cave some thirty to forty paces. We measured the way in by means of a cord, and went about 430 feet without needing to light torches. Daylight reaches this place because the cave forms one single gallery that stretches south-east to north-west. In the spot where light begins to fail we heard the hoarse screams of the nocturnal birds that, according to the Indians, live only in these underground caves.

Our boat was waiting for us in the Puerto de Arriba above the Atures cataract. On the narrow path that led to the embarcadero we were shown the distant rocks near the Ataruipe caves. We did not have time to visit that Indian cemetery though Father Zea had not stopped talking about the skeletons painted red with onoto inside the great jars. 'You will hardly believe, said the missionary, 'that these skeletons and painted vases, which we thought unknown to the rest of the world, have brought me trouble. You know the misery I endure in the Raudales. Devoured by mosquitoes, and lacking in bananas and cassava, yet people in Caracas envy me! I was denounced by a white man for hiding treasure that had been abandoned in the caves when the Jesuits had to leave. I was ordered to appear in Caracas in person and journeyed pointlessly over 150 leagues to declare that the cave contained only human bones and dried bats. However, commissioners were appointed to come up here and investigate. We shall wait a long time for these commissioners. The cloud of mosquitoes (nube de moscas) in the Raudales is a good defence.

The San Francisco mission, situated on the left bank of the Casiquiare, was named after one of the leaders of the boundary expedition, Don Joseph Solano. This educated officer never got any further than San Fernando de Atabapo; he had never seen the Río Negro waters or the Casiquiare, or the Orinoco east of the Guaviare. Ignorance of the Spanish language drove geographers to locate erroneously on the famous La Cruz Olmedilla map the 400 league route made by Joseph Solano to the sources of the Orinoco. The San Francisco mission was founded not by monks but by military authorities. Following the boundary expedition, villages were built wherever an officer or a corporal stopped with his soldiers. Some of the Indians withdrew and remained independent; others, whose chiefs were caught, joined the missions. Where there was no church they were happy to raise a great red wooden cross, and to build a casa fuerte, that is, a house with long beams placed horizontally on top of each other, next to it. This house had two floors; upstairs were placed small cannons; downstairs two soldiers lived, served by Indian families. Tamed Indians established themselves around the casa fuerte. In the event of an attack soldiers would gather the Indians together by sounding the horn, or the baked-earth botuto. These were the nineteen so-called Christian establishments founded by Don Antonio Santos. Military posts had no effect in civilizing the Indians living there. They figured on maps and in mission works as pueblos (villages) and as reducciones apostòlicas.

Our stay in Turbaco was extremely agreeable, and useful for our botanical collection. Even today those bamboo forests, the wild fertility of the land, the orchids carpeting the old ocotea and Indian fig-tree trunks, the majestic view of the snowy mountains, the light mist covering the valleys at sunrise, bunches of gigantic trees like green islands above a sea of mist, all return incessantly to my imagination. Our life at Turbaco was simple and hard-working; we were young, linked by similar tastes and characters, always full of hope in the future, on the eve of a journey that would take us to the highest Andean peaks, and volcanoes on fire in a country where earthquakes are common. We felt happier than at any other moment in our expedition. The years that have passed since then, not without bitterness and hardships, have added to the charms of these impressions; I would like to think that in his exile in the Southern hemisphere, in the isolation of Paraguay, my unfortunate friend Bonpland (145) might still recall our delightful herborizings. As Bonpland's health had cruelly suffered during our journey on the Orinoco and Casiquiare we decided to follow the advice of the locals and supply ourselves with all the comforts possible on our trip up the Magdalena. Instead of sleeping in hammocks or lying on the ground on skins, exposed to the nightly torment of mosquitoes, we did what was done in the country, and got hold of a mattress, a country-bed that was easy to unfold, as well as a toldo, a cotton sheet, which could fold under the mattress and make a kind of closed-off tent that no insects could penetrate. Two of these beds, rolled into cylinders of thick leather, were packed on to a mule. I could not praise this system more; it is far superior to the mosquito net.