We spent the night in a house occupied by a military post of eight soldiers under a Spanish sergeant. It was a hospice, built next to a powder-magazine. The summit of Imposible, as far as I could make out, was covered with a sandstone rich in quartz, without fossils. Here, as on the neighboring hills, the strata are lined regularly along a north-north-east, south-south-west axis.

When we reached the high seas my travelling companions got so seared from the boat's rolling in a rough sea that they decided to continue by land from Higuerote to Caracas, despite having to cross a wild and humid country in constant rain and flooding rivers. Bonpland also chose the land way, which pleased me as he collected numerous new plants. I stayed alone with the Guaiquerí pilot as I thought it too dangerous to lose sight of the precious instruments that I wanted to take up the Orinoco.

The moment of leaving Europe for the first time is impressive. We vainly recall the frequency of communications between the two worlds; wevainly reflect how, thanks to the improved state of navigation, we may nowcross the Atlantic, which compared to the Pacific is but a shortish arm ofthe sea; yet what we feel whenwe begin our first long-distance voyage is none the less accompanied by adeep emotion, unlike any we may have felt in our youth. Separated from theobjects of our dearest affections, and entering into a new life, we areforced to fall back on ourselves, and we feel more isolated than we have ever felt before.

When we carefully examine this wild part of America we imagine how it was in primitive times when the land was peopled in stages, and seem to be present at the birth of human societies. In the New World we do not see the progressive developments of civilization, those moments of rest, those stations in the lives of a people. Such is the wonderful fertility of nature that the Indian's field is a patch of land. To clear it means setting fire to branches. To farm means dropping a few seeds into the ground. However far back in time you go in thought in these dense jungles the Indians have got their food from the earth, but as this earth produces abundantly on a small patch, without much work, these people often change their homes along the river banks. Still today, the Orinoco Indians travel with their seeds, transporting what they cultivate (conucos), like the Arab does his tents.

The hypothesis that during the Cumana earthquakes elastic fluids escape from the earth's surface seems confirmed by the dreadful noise heard during the shocks near the wells in the plain of Charas. Water and sand are sometimes thrown 20 feet high. Similar phenomena did not escape the ancients' notice in areas of Greece and Asia Minor, in caves, crevices and underground rivers. Nature, in its uniform progress, everywhere gives birth to the same ideas concerning the causes of earthquakes, and man, forgetting the measure of its force, tries to diminish the effect of underground explosions. What the great Roman naturalist Pliny said about how wells and caves are the cause is repeated by the most ignorant Indians of Quito when they show travelers the guaicos, or crevices, of Pichincha.

The macavahu, called by the missionaries viuditas, or 'widows in mourning', has soft glossy black hair. Its face is a kind of whitish-blue square mask, which contains its eyes, nose and mouth. Its ears have an edge; are small, pretty and hairless. Its neck has a white area in two rings. Its feet, or hind legs, are black like its body, but its forehands are white outside and black inside. These white spots led the missionaries to recognize a veil, a neck scarf and the gloves of a widow in mourning. The character of this little monkey, which sits up on its hind legs to eat, is not related to its appearance. It has a wild and shy air, and often refuses food even when ravenous. We have seen it remain motionless for hours without sleeping, attentive to everything happening around it. The viudita, when alone, becomes furious at the sight of a bird, and climbs and runs with astonishing speed, and, like a eat, leaps on to its prey and eats all it can. The viuditas accompanied us throughout our entire voyage on the Casiquiare and Río Negro. It is an advantage to study animals for several months in the open air, and not indoors where they lose their natural vivacity.

I have shown that winged insects which live in society and whose suckers contain a liquid that irritates skin make vast territories virtually uninhabitable. Other insects, just as small, called termites (comején) create insuperable obstacles to the progress of civilization in several hot countries. They rapidly devour paper, cardboard and parchment, and thus destroy archives and libraries. Whole provinces of Spanish America do not have any document that dates back more than a hundred years.