But the shores of Lake Valencia are not famed solely for their picturesque beauties: the basin presents several phenomena whose interpretation holds great interest for natural historians and for the inhabitants. What causes the lowering of the lake's water-level? Is it receding faster than before? Will the balance between the flowing in and the draining out be restored, or will the fear that the lake might dry up be proved justified?

The farmers and their slaves cut a path through the jungle to the first Juagua river waterfall, and on the 10th of September we made our excursion to the Cuchivano crevice. Entering the cave we saw a disemboweled porcupine and smelled the stink of excrement, similar to that of European cats, and knew that a jaguar had been near by. For safety the Indians returned to the farm to fetch small dogs. It is said that when you meet a jaguar in your path he will leap on to a dog before a man. We did not follow the bank of the torrent, but a rocky wall overhanging the water. We walked on a very narrow ledge along the side of a precipice with a drop of some 200 to 300 feet. When it narrowed, so that we could not walk along it any further, we climbed down to the torrent and crossed it on foot, or on the backs of slaves, to climb up the other side. Climbing is very tiring, and you cannot trust the lianas, which, like thick rope, hang from tree-tops. Creepers and parasites hang loosely from the branches they grip; their stalks together weigh a lot, and if you slip and grab one of the lianas you risk bringing down a tangle of green branches. The vegetation became impenetrable the more we advanced. In some places the roots of trees grew in the existing cracks between strata and had burst the calcareous rock. We could hardly carry the plants we picked at each step. The canna, the heliconia with pretty purple flowers, the costus and other plants from the Amomum genus reach here the height of 8 to 50 feet. Their tender, fresh green leaves, their silky sheen and the extraordinary development of their juicy pulp contrast with the brown of the arborescent ferns whose leaves are so delicately jagged. The Indians made deep incisions in the tree trunks with their long knives to draw our attention to the beauty of the red-and gold-colored woods, which one day will be sought after by our furniture makers. They showed us a plant with composite flowers that reaches some 20 feet high (Eupatorium laevigatum), the so-called 'Rose of Belveria' (Brownea racemosa), famous for the brilliance of its purple flowers, and the local 'dragon's blood', a species of euphorbia not yet catalogued, whose red and astringent sap is used to strengthen the gums. They distinguished species by their smell and by chewing their woody fibers. Two Indians, given the same wood to chew, pronounced, often without hesitation, the same name. But we could not take advantage of our guides' wisdom, for how could they reach leaves, flowers and fruit (53) growing on branches some 50 to 60 feet above the ground? We were struck in this gorge by the fact that the bark of the trees, even the ground, were covered in moss and lichen.

Frightened about being exposed too long to the unhealthy Cartagena airs we moved to the Indian village of Turbaco (once called Tarasco) on the 6th of April. It is situated in a delicious place where the jungle begins some 5 leagues south-south-east of Pipa. We were happy to leave a foul inn (fonda) packed with soldiers left over from General Rochambeau's unfortunate expedition. (144) Interminable discussions about the need to be cruel to the blacks of Santo Domingo reminded me of the opinions and horrors of the sixteenth-century conquistadores. Pombo lent us his beautiful house in Turbaco, built by Archbishop Viceroy Gòngora. We stayed as long as it took us to prepare for our journey up the Magdalena, and then the long land trip from Honda to Bogotà, Popoyàn and Quito. Few stays in the Tropics have pleased me more. The village lies some 180 toises above sea-level. Snakes are very common and chase rats into the houses. They climb on to roofs and wage war with the bats, whose screaming annoyed us all night. The Indian huts covered a steep plateau so that everywhere you can view shady valleys watered by small streams. We especially enjoyed being on our terrace at sunrise and sunset as it faced the Sierra Nevada de Santa Marta, some 35 leagues distant. The snow-covered peaks probably San Lorenzo - are clearly seen from Turbaco when the wind blows and brings cooler air. Thick vegetation covers the hills and plains between the Mahates dyke and the snowy mountains: they often reminded us of the beautiful Orinoco mountains. We were surprised to find, so close to the coast in a land frequented by Europeans for over three centuries, gigantic trees belonging to completely unknown species, such as the Rhinocarpus excelsa (which the creoles call caracoli because of its spiral-shaped fruit), the Ocotea turbacensis and the mocundo or Cavanillesia platanifolia, whose large fruit resemble oiled paper lanterns hanging at the tip of each branch.

April 30th. We continued upstream on the Atabapo for 5 miles, then instead of following this river to its source, where it is called the Atacavi, we entered the Temi river. Before reaching this tributary, near the Guasacavi mouth, a granite outcrop on the west bank fixed our attention: it is called the rock of the Guahiba Indian woman, or the Mother Rock, the Piedra de la Madre. Father Zea could not the explain its bizarre name, but a few weeks later another missionary told us a story that stirred up painful feelings. If, in these deserted places, man leaves hardly any traces behind him, it is doubly humiliating for a European to see in the name of a rock a memory of the moral degradation of whites that contrasts the virtue of a wild Indian with the barbarity of civilized men!

We waited nearly the whole day in the miserable village of Mahates for the animals carrying our belongings to the landing-stage on the Magdalena river. It was suffocatingly hot; at this time of year there is not a breath of wind. Feeling depressed we lay on the ground in the main square. My barometer had broken and it was the last one I had. I had anticipated measuring the slope of the river and fixing the speed of its current and the position of different stages through astronomical observations. Only travelers know how painful it is to suffer such accidents, which continued to dog me in the Andes and in Mexico; each time this happened I felt the same. Of all the instruments a traveler should carry the barometer is the one, despite all its imperfections, that caused me the most worry and whose loss I felt the most. Only chronometers, which sometimes suddenly and unpredictably change their rates, give rise to the same sense of loss. Indeed, after travelling thousands of leagues over land with astronomical and physical instruments, you are tempted to cry out: 'Lucky are those who travel without instruments that break, without dried plants that get wet, without animal collections that rot; lucky are those who travel the world to see it with their own eyes, trying to understand it, and recollecting the sweet emotions that nature inspires!

May 1st. The Indians wanted to leave long before sunrise. We got up before them because we had hoped to see some stars, but in this humid, thick-jungled zone the nights were getting darker and darker as we approached the Río Negro and the interior of Brazil. We stayed in the river until dawn, fearing to get lost in the trees. But as soon as the sun rose we went through the flooded jungle to avoid the strong current. We reached the confluence of the Temi and Tuamini and went upstream on the latter south-west, reaching the Javita mission on the banks of the Tuamini at about eleven in the morning. It was at this Christian mission that we hoped to find help in carrying our pirogue to the Río Negro. A minor accident shows how fearful the little sagouin monkeys are. The noise of the 'blowers' seared one of them and it fell into the water. These monkeys can hardly swim, and we just managed to save it.