Below the island of Carizales we observed a diminution of the waters of the river, at which we were the more surprised, as, after the bifurcation at la Boca de Arichuna, there is no branch, no natural drain, which takes away water from the Apure. The loss is solely the effect of evaporation, and of filtration on a sandy and wet shore. Some idea of the magnitude of these effects may be formed, from the fact that we found the heat of the dry sands, at different hours of the day, from 36 to 52 degrees, and that of sands covered with three or four inches of water 32 degrees. The beds of rivers are heated as far as the depth to which the solar rays can penetrate without undergoing too great an extinction in their passage through the superincumbent strata of water. Besides, filtration extends in a lateral direction far beyond the bed of the river. The shore, which appears dry to us, imbibes water as far up as to the level of the surface of the river. We saw water gush out at the distance of fifty toises from the shore, every time that the Indians struck their oars into the ground. Now these sands, wet below, but dry above, and exposed to the solar rays, act like sponges, and lose the infiltrated water every instant by evaporation. The vapour that is emitted, traverses the upper stratum of sand strongly heated, and becomes sensible to the eye when the air cools towards evening. As the beach dries, it draws from the river new portions of water; and it may be easily conceived that this continual alternation of vaporization and lateral absorption must cause an immense loss, difficult to submit to exact calculation. The increase of these losses would be in proportion to the length of the course of the rivers, if from their source to their mouth they were equally surrounded by a flat shore; but these shores being formed by deposits from the water, and the water having less velocity in proportion as it is more remote from its source, throwing down more sediment in the lower than in the upper part of its course, many rivers in hot climates undergo a diminution in the quantity of their water, as they approach their outlets. Mr. Barrow observed these curious effects of sands in the southern part of Africa, on the banks of the Orange River. They have also become the subject of a very important discussion, in the various hypotheses that have been formed respecting the course of the Niger.* (* Geographers supposed, for a long period, that the Niger was entirely absorbed by the sands, and evaporated by the heat of the tropical sun, as no embouchure could be found on the western coast of Africa to meet the requirements of so enormous a river. It was discovered, however, by the Landers, in 1830, that it does really flow into the Atlantic; yet the cause mentioned above is so powerful, that of all the numerous branches into which it separates at its mouth, only one (the Nun River) is navigable even for light ships, and for half the year even those are unable to enter.)
Near the Vuelta de Basilio, where we landed to collect plants, we saw on the top of a tree two beautiful little monkeys, black as jet, of the size of the sai, with prehensile tails. Their physiognomy and their movements sufficiently showed that they were neither the quato (Simia beelzebub) nor the chamek, nor any of the Ateles. Our Indians themselves had never seen any that resembled them. Monkeys, especially those living in troops, make long emigrations at certain periods, and consequently it happens that at the beginning of the rainy seasons the natives discover round their huts different kinds which they have not before observed. On this same bank our guides showed us a nest of young iguanas only four inches long. It was difficult to distinguish them from common lizards. There was no distinguishing mark yet formed but the dewlap below the throat. The dorsal spines, the large erect scales, all those appendages that render the iguana so remarkable when it attains its full growth, were scarcely traceable.
The flesh of this animal of the saurian family appeared to us to have an agreeable taste in every country where the climate is very dry; we even found it so at periods when we were not in want of other food. It is extremely white, and next to the flesh of the armadillo, one of the best kinds of food to be found in the huts of the natives.
It rained toward evening, and before the rain fell, swallows, exactly resembling our own, skimmed over the surface of the water. We saw also a flock of paroquets pursued by little goshawks without crests. The piercing cries of these paroquets contrasted singularly with the whistling of the birds of prey. We passed the night in the open air, upon the beach, near the island of Carizales. There were several Indian huts in the neighbourhood, surrounded with plantations. Our pilot assured us beforehand that we should not hear the cries of the jaguar, which, when not extremely pressed by hunger, withdraws from places where he does not reign unmolested. "Men put him out of humour" (los hombres lo enfadan), say the people in the Missions. A pleasant and simple expression, that marks a well-observed fact.
Since our departure from San Fernando we had not met a single boat on this fine river. Everything denoted the most profound solitude. On the morning of the 3rd of April our Indians caught with a hook the fish known in the country by the name of caribe,* (* Caribe in the Spanish language signifies cannibal.) or caribito, because no other fish has such a thirst for blood. It attacks bathers and swimmers, from whom it often bites away considerable pieces of flesh. The Indians dread extremely these caribes; and several of them showed us the scars of deep wounds in the calf of the leg and in the thigh, made by these little animals. They swim at the bottom of rivers; but if a few drops of blood be shed on the water, they rise by thousands to the surface, so that if a person be only slightly bitten, it is difficult for him to get out of the water without receiving a severer wound. When we reflect on the numbers of these fish, the largest and most voracious of which are only four or five inches long, on the triangular form of their sharp and cutting teeth, and on the amplitude of their retractile mouths, we need not be surprised at the fear which the caribe excites in the inhabitants of the banks of the Apure and the Orinoco. In places where the river was very limpid, where not a fish appeared, we threw into the water little morsels of raw flesh, and in a few minutes a perfect cloud of caribes had come to dispute their prey. The belly of this fish has a cutting edge, indented like a saw, a characteristic which may be also traced in the serra-salmes, the myletes, and the pristigastres. The presence of a second adipous dorsal fin, and the form of the teeth, covered by lips distant from each other, and largest in the lower jaw, place the caribe among the serra-salmes. Its mouth is much wider than that of the myletes of Cuvier. Its body, toward the back, is ash-coloured with a tint of green, but the belly, the gill-covers, and the pectoral, anal, and ventral fins, are of a fine orange hue. Three species are known in the Orinoco, and are distinguished by their size. The intermediate appears to be identical with the medium species of the piraya, or piranha, of Marcgrav.* (* Salmo rhombeus, Linn.) The caribito has a very agreeable flavour. As no one dares to bathe where it is found, it may be considered as one of the greatest scourges of those climates, in which the sting of the mosquitos and the general irritation of the skin render the use of baths so necessary.
We stopped at noon in a desert spot called Algodonal. I left my companions while they drew the boat ashore and were occupied in preparing our dinner. I went along the beach to get a near view of a group of crocodiles sleeping in the sun, and lying in such a manner as to have their tails, which were furnished with broad plates, resting on one another. Some little herons,* white as snow, walked along their backs, and even upon their heads, as if passing over trunks of trees. (* Garzon chico. It is believed, in Upper Egypt, that herons have an affection for crocodiles, because they take advantage in fishing of the terror that monstrous animal causes among the fishes, which he drives from the bottom to the surface of the water; but on the banks of the Nile, the heron keeps prudently at some distance from the crocodile.) The crocodiles were of a greenish grey, half covered with dried mud; from their colour and immobility they might have been taken for statues of bronze. This excursion had nearly proved fatal to me. I had kept my eyes constantly turned towards the river; but, whilst picking up some spangles of mica agglomerated together in the sand, I discovered the recent footsteps of a tiger, easily distinguishable from their form and size. The animal had gone towards the forest, and turning my eyes on that side, I found myself within eighty paces of a jaguar that was lying under the thick foliage of a ceiba. No tiger had ever appeared to me so large.
There are accidents in life against which we may seek in vain to fortify our reason. I was extremely alarmed, yet sufficiently master of myself and of my motions to enable me to follow the advice which the Indians had so often given us as to how we ought to act in such cases. I continued to walk on without running, avoided moving my arms, and I thought I observed that the jaguar's attention was fixed on a herd of capybaras which was crossing the river. I then began to return, making a large circuit toward the edge of the water. As the distance increased, I thought I might accelerate my pace. How often was I tempted to look back in order to assure myself that I was not pursued! Happily I yielded very tardily to this desire. The jaguar had remained motionless. These enormous cats with spotted robes are so well fed in countries abounding in capybaras, pecaries, and deer, that they rarely attack men. I arrived at the boat out of breath, and related my adventure to the Indians. They appeared very little interested by my story; yet, after having loaded our guns, they accompanied us to the ceiba beneath which the jaguar had lain. He was there no longer, and it would have been imprudent to have pursued him into the forest, where we must have dispersed, or advanced in single file, amidst the intertwining lianas.
In the evening we passed the mouth of the Cano del Manati, thus named on account of the immense quantity of manatees caught there every year. This herbivorous animal of the cetaceous family, is called by the Indians apcia and avia,* and it attains here generally ten or twelve feet in length. (* The first of these words belongs to the Tamanac language, and the second to the Ottomac. Father Gili proves, in opposition to Oviedo, that manati (fish with hands) is not Spanish, but belongs to the languages of Hayti (St. Domingo) and the Maypures. I believe also that, according to the genius of the Spanish tongue, the animal would have been called manudo or manon, but not manati.) It usually weighs from five hundred to eight hundred pounds, but it is asserted that one has been taken of eight thousand pounds weight. The manatee abounds in the Orinoco below the cataracts, in the Rio Meta, and in the Apure, between the two islands of Carizales and Conserva. We found no vestiges of nails on the external surface or the edges of the fins, which are quite smooth; but little rudiments of nails appear at the third phalanx, when the skin of the fins is taken off. We dissected one of these animals, which was nine feet long, at Carichana, a Mission of the Orinoco. The upper lip was four inches longer than the lower one. It was covered with a very fine skin, and served as a proboscis. The inside of the mouth, which has a sensible warmth in an animal newly killed, presented a very singular conformation. The tongue was almost motionless; but in front of the tongue there was a fleshy excrescence in each jaw, and a cavity lined with a very hard skin, into which the excrescence fitted. The manatee eats such quantities of grass, that we have found its stomach, which is divided into several cavities, and its intestines, (one hundred and eight feet long,) filled with it. On opening the animal at the back, we were struck with the magnitude, form, and situation of its lungs. They have very large cells, and resemble immense swimming-bladders. They are three feet long. Filled with air, they have a bulk of more than a thousand cubic inches. I was surprised to see that, possessing such considerable receptacles for air, the manatee comes so often to the surface of the water to breathe. Its flesh is very savoury, though, from what prejudice I know not, it is considered unwholesome and apt to produce fever. It appeared to me to resemble pork rather than beef. It is most esteemed by the Guamos and the Ottomacs; and these two nations are particularly expert in catching the manatee. Its flesh, when salted and dried in the sun, can be preserved a whole year; and, as the clergy regard this mammiferous animal as a fish, it is much sought during Lent. The vital principal is singularly strong in the manatee; it is tied after being harpooned, but is not killed till it has been taken into the canoe. This is effected, when the animal is very large, in the middle of the river, by filling the canoe two-thirds with water, sliding it under the animal, and then baling out the water by means of a calabash. This fishery is most easy after great inundations, when the manatee has passed from the great rivers into the lakes and surrounding marshes, and the waters diminish rapidly. At the period when the Jesuits governed the Missions of the Lower Orinoco, they assembled every year at Cabruta, below the mouth of the Apure, to have a grand fishing for manatees, with the Indians of their Missions, at the foot of the mountain now called El Capuchino. The fat of the animal, known by the name of manatee-butter (manteca de manati,) is used for lamps in the churches; and is also employed in preparing food. It has not the fetid smell of whale-oil, or that of the other cetaceous animals which spout water. The hide of the manati, which is more than an inch and a half thick, is cut into slips, and serves, like thongs of ox-leather, to supply the place of cordage in the Llanos. When immersed in water, it has the defect of undergoing a slight degree of putrefaction. Whips are made of it in the Spanish colonies. Hence the words latigo and manati are synonymous. These whips of manatee-leather are a cruel instrument of punishment for the unhappy slaves, and even for the Indians of the Missions, though, according to the laws, the latter ought to be treated like freemen.
We passed the night opposite the island of Conserva. In skirting the forest we were surprised by the sight of an enormous trunk of a tree seventy feet high, and thickly set with branching thorns. It is called by the natives barba de tigre. It was perhaps a tree of the berberideous family.* (* We found, on the banks of the Apure, Ammania apurensis, Cordia cordifolia, C. grandiflora, Mollugo sperguloides, Myosotis lithospermoides, Spermacocce diffusa, Coronilla occidentalis, Bignonia apurensis, Pisonia pubescens, Ruellia viscosa, some new species of Jussieua, and a new genus of the composite family, approximating to Rolandra, the Trichospira menthoides of M. Kunth.) The Indians had kindled fires at the edge of the water. We again perceived that their light attracted the crocodiles, and even the porpoises (toninas), the noise of which interrupted our sleep, till the fire was extinguished. A female jaguar approached our station whilst taking her young one to drink at the river. The Indians succeeded in chasing her away, but we heard for a long time the cries of the little jaguar, which mewed like a young cat. Soon after, our great dog was bitten, or, as the Indians say, stung, at the point of the nose, by some enormous bats that hovered around our hammocks. These bats had long tails, like the Molosses: I believe, however, that they were Phyllostomes, the tongue of which, furnished with papillae, is an organ of suction, and is capable of being considerably elongated. The dog's wound was very small and round; and though he uttered a plaintive cry when he felt himself bitten, it was not from pain, but because he was frightened at the sight of the bats, which came out from beneath our hammocks. These accidents are much more rare than is believed even in the country itself. In the course of several years, notwithstanding we slept so often in the open air, in climates where vampire-bats,* (* Verspertilio spectrum.) and other analogous species are so common, we were never wounded. Besides, the puncture is no-way dangerous, and in general causes so little pain, that it often does not awaken the person till after the bat has withdrawn.
The 4th of April was the last day we passed on the Rio Apure. The vegetation of its banks became more and more uniform. During several days, and particularly since we had left the Mission of Arichuna, we had suffered cruelly from the stings of insects, which covered our faces and hands. They were not mosquitos, which have the appearance of little flies, or of the genus Simulium, but zancudos, which are really gnats, though very different from our European species.* (* M. Latreille has discovered that the mosquitos of South Carolina are of the genus Simulium (Atractocera meigen.) These insects appear only after sunset. Their proboscis is so long that, when they fix on the lower surface of a hammock, they pierce through it and the thickest garments with their sting.