The external edges of La Caldera are almost perpendicular, rather like the Somma seen from the Atrio del Cavallo. We got to the bottom of the crater following a trail of broken lava from the eastern breach of the wall. We only felt the heat above the crevices, which exhaled watery vapors with a strange buzzing sound. Some of these crevices can be found on the outside of the crater, on the external parapet that surrounds it. A thermometer placed inside one of them rose suddenly from 68°C to 75°C. This would have risen higher, but we had to pull the thermometer out to prevent our hands from being burned It might be thought that these vapors, which escape in puffs of air, contain muriatic or sulphuric acids, but when condensed they had no particular taste. Experiments showed that these chimneys exhale pure water only.

By the morning of the 21st of June we were on our way to the volcano's summit. The day was not fine and the peak's summit, generally visible from Orotava from sunrise to ten at night, was covered in cloud. What links an excursion to the peak with similar ones to Chamonix or Etna is that one is obliged to follow guides, and sees only what has already been seen and described by previous travelers.

MEsmeralda is the most famous place on the Orinoco for the making of the active poison that is used in war, out hunting and, surprisingly, as a remedy against gastric illnesses. The poison of the Amazonian Tikuna, the upas-tieute of Java and the Guianan curare are the most poisonous substances known. Already by the sixteenth century Raleigh had heard the word urari spoken, signifying a vegetable substance used to poison arrows. However, nothing was known for sure in Europe about this poison.

The pilots trusted the ship's log more than my time- keeper, and smiled at my prediction that we would soon sight land, sure that we still had two to three days of sailing. It was with great satisfaction that on the 13th, at about six in the morning, high land was seen through the mist by someone from the mast. A strong wind blew and the sea was very rough. Every now and then heavy drops of rain fell. Everything pointed to a difficult situation. The captain intended to pass through the channel that separates the islands of Tobago and Trinidad and, knowing that our corvette was slow to turn, feared the south wind and the approach to the Boca del Dragon.

A little above the Davipe mission the Río Negro receives a branch of the Casiquiare whose existence is a remarkable phenomenon in the history of river branching. This branch emerges from the Casiquiare, north of Vasiva, under the name Itinivi; and after crossing a flat, virtually uninhabited country some 25 leagues long, pours into the Río Negro under the name of Río Conorichite. It seemed to me, near its mouth, to be 120 toises wide, and added large quantities of white waters to the black waters. Even though the Conorichite current is very fast, you shorten the journey from Davipe to Esmeralda by three days using this canal. It is not surprising to find a double communication between the Casiquiare and the Río Negro when you recall that so many American rivers form deltas when they meet other rivers. In this way the Branco and the Jupura pour into the Río Negro and Amazon through many branches. At the confluence with the Jupura there is another more extraordinary phenomenon. Before joining the Amazon this river, which is its main recipient, sends three branches called Uaranapu, Manhama and Avateprana to the Jupura, which is none other than its tributary. The Amazon thus sends its waters into the Jupura before receiving the waters of the latter back.

The vagabonds of the plains had as little interest in working as the Indians, who were obliged to live 'under the sound of the church bell'. The former used their pride to justify their indolence. In the missions every colored person who is not completely black like an African, or copper-colored like an Indian, calls himself a Spaniard; belongs to the gente de razon, that is, gifted with reason, and this reason', which is both arrogant and lazy, tells the whites and those who think themselves white that agriculture is work for slaves, poitos and newly converted Indians. As these American colonists were separated from their homelands by jungles and savannahs they soon dispersed, some going north to Caura and Caroni, and others south to the Portuguese possessions. Thus, the fame of the emerald mines of Duida died out, and Esmeralda became a cursed place of banishment for monks where the dreadful cloud of mosquitoes darkens the atmosphere all year round. When the father superior of the mission wants to upbraid his monks he threatens to send them to Esmeralda: 'That is, say the monks, 'to be condemned to mosquitoes, to be devoured by zancudos gritones (shouting flies), which God seems to have created to punish man.

That night Bonpland had a fever; but being brave, and gifted with that good character which a traveler should rank higher than anything else, he took up his work the next morning. The blow from the macana reached the crown of his head; he felt it for two to three months, up to our stay in Caracas. When he bent down to pick up plants he was several times made dizzy, which made us worry that some internal damage might have been done. Luckily our fears had no base and these alarming symptoms slowly vanished. The Cumanà inhabitants showed us the greatest kindness. We discovered that the mulatto came from one of the Indian villages round the great Maracaibo lake. He had served on a pirate ship from the island of Santo Domingo and, after a quarrel with the captain, had abandoned ship on the Cumanà coast. Why, after knocking one of us down, did he then try to steal a hat? In an interrogation his answers were so confused and stupid that we were unable to clear this matter up.