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.

We left the Esmeralda mission on the 23rd of May. We were not exactly ill, but emaciated and weak thanks to the torment of mosquitoes, the bad food and the long journey on that narrow and damp pirogue. We did not go further up the Orinoco than the mouth of the Guapo; had we wanted to reach the Orinoco sources we would have gone beyond this point, but private travelers are not authorized to leave pacified areas. From the Guapo river to the Guaharibo cataract there are only 15 leagues. But the cataract is crossed by a liana bridge where Indians armed with bows and arrows stop whites from entering their lands. Up to the present time the Orinoco posed two distinct problems for geographers: its sources, and the nature of its communications with the Amazon. This latter was the aim of our journey.

Our stay in Carichana let us gather our strength. Bonpland was carrying the germs of a serious illness, and needed rest. But as the delta of the rivers Horeda and Paruasi is covered with dense vegetation he could not resist a long botanical excursion and soaked himself several times a day in the water. Fortunately in the missionary's house we were supplied with bread made from maize flour, and even milk.

I acquired some statistical notions on the spot by consulting the Uruana missionary and the traders. The three beaches furnish annually some 5, botijas, or jars of oil. Two hundred eggs yield enough oil to fill a bottle, and 5, eggs to fill the jar. If we estimate the number of eggs laid by each turtle as 116, and reckon that one third are destroyed, we can calculate that 330, arrau turtles must lay 33 million eggs on the three shores. But this calculation is far too low. For example, the number of eggs that hatch before the cosecha is so prodigious that near the Uruana camp I saw the whole beach swarming with little turtles escaping from the Indian children.

The confidence of the Indians helped to make us feel braver. One agrees with them that tigers fear fire, and never attack a man in his hammock. If you ask the Indians why jungle animals make such a din at certain moments of the night they say, 'They are celebrating the full moon. I think that the din comes from deep in the jungle because a desperate fight is taking place. jaguars, for example, hunt tapir and peccaries, who protect themselves in large herds, trampling down the vegetation in their way.

According to my careful trigonometric calculations the Duida mountain rises 2, meters above the Esmeralda plain, some 2, meters, more or less, above sea-level. I say more or less because I had the bad luck to break my barometer before our arrival in Esmeralda. The rain had been so heavy that we could not protect this instrument from the damp and, with the unequal expansion of the wood, the tubes snapped. This accident especially annoyed me as no barometer had ever lasted so long on such a journey. The granite summit of the Duida falls so steeply that Indians have not managed to climb it. Though the mountains are not as high as people think, it is the highest point of the chain that stretches from the Orinoco to the Amazon.

The military establishment of this frontier consists of seventeen soldiers, ten of whom are detached in neighboring missions. The humidity is such that hardly four rifles work. The Portuguese have twenty-five better-dressed and better-armed men in the fort of San Jose de Maravitanos. In the San Carlos mission we found a garita, or square house, built with unbaked bricks, with six rooms. The fort, or as they prefer to call it, the Castillo de San Felipe, is on the right bank of the Río Negro, vis-à-vis San Carlos. The commander showed some scruples, and refused to allow Bonpland and myself to visit the fort as our passports clearly stated we could measure mountains and perform trigonometric operations on land, but we could not see inside fortified places. Our fellow traveler, Don Nicolás Soto, a Spanish officer, was luckier, and was allowed to cross the river.