Despite the speed of the current and the effort of our rowers it took us twelve hours on the river to reach the San Carlos fort on the Rio Negro. We left the mouth of the Casiquiare on our left, and the little island of Cumarai on our right. Here they believe that the fort lies on the equator itself but after my observations made on the Culimacari rock, it lies on 1.54'11".

The missionary in San Fernando was an Aragonese Capuchin, well advanced in years but very strong and lively. His obesity, his good humor and his interest in battles and sieges contradicted the ideas held in northern countries concerning the melancholic reveries and contemplative life of missionaries. Though extremely busy organizing the slaughter of a cow for the following day he received us good-naturedly, and let us hang our hammocks in a gallery of his house. Sitting in his redwood armchair most of the day without doing anything, he complained of what he called the laziness and ignorance of his countrymen. He asked us thousands of questions about the real purpose of our journey, which to him seemed hazardous and quite useless. Here, as on the Orinoco, we grew weary of the lively curiosity manifested by Europeans in the middle of American jungles for the wars and political storms in the Old World.

There is exciting chemical and physiological work to be done in Europe with the effects of New World poisons once we are sure that different poisons from different areas are properly distinguished. As far as our botanical knowledge about these poisonous plants is concerned we could sort out the differences only very slowly. Most Indians who make poison arrows completely ignore the nature of poisonous substances used by other tribes. A mystery surrounds the history of toxics and antidotes. Among wild Indians the preparation is the monopoly of piaches, who are priests, tricksters and doctors all at once; it is only with Indians from the missions that you can learn anything certain about such problematic matters. Centuries passed before any Europeans learned, thanks to Mutis's researches, that the bejuco del guaco is the most powerful antidote to snake bites, and which we were the first to describe botanically.

When we were about to leave the Can mission we had an argument with our Indian muleteers. To our amazement they had discovered that we were transporting skeletons from the Ataruipe caves, and were sure that the mule carrying 'the corpses of our ancient relatives' would die on the journey. All our precautions to hide the bones had been useless; nothing escapes the Carib's sense of smell. We needed the missionary's authority to be able to leave. We had to cross the Can river in a boat and ford, or perhaps I should say swim, the Río de Agua Clara. Quicksand on the bottom made the crossing during the floods very tiring. You are surprised to find such strong currents in flat land. We spent unpleasant nights out at Matagorda and Los Riecitos. Everywhere we saw the same things: small huts made of reed and roofed with leather, men on horseback with lances, guarding the cattle, semi-wild herds of horned cattle all the same color, fighting for grass with horses and mules. Not a goat or a sheep in these immense steppes!

If America does not occupy an important place in the history of mankind, and in the revolutions that have shattered the world, it does offer a wide field for a naturalist. Nowhere else does nature so vividly suggest general ideas on the cause of events, and their mutual interrelationships. I do not mean by this solely the overpowering vegetation and freshness of organic life, the different climates we experience as we climb the cordilleras and navigate those immense rivers, but also the geology and natural history of an unknown continent. A traveler can count himself lucky if he has taken advantage of his travels by adding new facts to the mass of those previously discovered!

These scattered features of the countryside, this trait of solitude and grandeur, characterizes the course of the Orinoco, one of the greatest New World rivers. Everywhere water, like land, displays its unique characteristics. The Orinoco bed has no similarities with the Meta, Guaviare, Río Negro or Amazon beds. These differences do not depend solely on the width or speed of the current; they derive from a combination of relations easier to grasp on the spot than to define precisely. In the same way, the shape of the waves, the color of the water, the kind of sky and clouds, all help a navigator guess whether he is in the Atlantic, the Mediterranean or in the equinoctial part of the Pacific.