By this abra, the farm of Barbula, and an eastern branch of the ravine, a new road is being constructed from Valencia to Porto Cabello. It will be so short, that it will require only four hours to reach the port; and the traveller will be able to go and return in the same day from the coast to the valleys of Aragua. In order to examine this road, we set out on the 26th of February in the evening for the farm of Barbula.
On the morning of the 27th we visited the hot springs of La Trinchera, three leagues from Valencia. The ravine is very large, and the descent almost continual from the banks of the lake to the sea-coast. La Trinchera takes its name from some fortifications of earth, thrown up in 1677 by the French buccaneers, who sacked the town of Valencia. The hot springs (and this is a remarkable geological fact,) do not issue on the south side of the mountains, like those of Mariara, Onoto, and the Brigantine; but they issue from the chain itself almost at its northern declivity. They are much more abundant than any we had till then seen, forming a rivulet which, in times of the greatest drought, is two feet deep and eighteen wide. The temperature of the water, measured with great care, was 90.3 degrees of the centigrade thermometer. Next to the springs of Urijino, in Japan, which are asserted to be pure water at 100 degrees of temperature, the waters of the Trinchera of Porto Cabello appear to be the hottest in the world. We breakfasted near the spring; eggs plunged into the water were boiled in less than four minutes. These waters, strongly charged with sulphuretted hydrogen, gush out from the back of a hill rising one hundred and fifty feet above the bottom of the ravine, and tending from south-south-east to north-north-west. The rock from which the springs gush, is a real coarse-grained granite, resembling that of the Rincon del Diablo, in the mountains of Mariara. Wherever the waters evaporate in the air, they form sediments and incrustations of carbonate of lime; possibly they traverse strata of primitive limestone, so common in the mica-slate and gneiss of the coasts of Caracas. We were surprised at the luxuriant vegetation that surrounds the basin; mimosas with slender pinnate leaves, clusias, and fig-trees, have pushed their roots into the bottom of a pool, the temperature of which is 85 degrees; and the branches of these trees extended over the surface of the water, at two or three inches distance. The foliage of the mimosas, though constantly enveloped in the hot vapours, displayed the most beautiful verdure. An arum, with a woody stem, and with large sagittate leaves, rose in the very middle of a pool the temperature of which was 70 degrees. Plants of the same species vegetate in other parts of those mountains at the brink of torrents, the temperature of which is not 18 degrees. What is still more singular, forty feet distant from the point whence the springs gush out at a temperature of 90 degrees, other springs are found perfectly cold. They all follow for some time a parallel direction; and the natives showed us that, by digging a hole between the two rivulets, they could procure a bath of any given temperature they pleased. It seems remarkable, that in the hottest as well as the coldest climates, people display the same predilection for heat. On the introduction of Christianity into Iceland, the inhabitants would be baptized only in the hot springs of Hecla: and in the torrid zone, in the plains, as well as on the Cordilleras, the natives flock from all parts to the thermal waters. The sick, who come to La Trinchera to use vapour-baths, form a sort of frame-work over the spring with branches of trees and very slender reeds. They stretch themselves naked on this frame, which appeared to me to possess little strength, and to be dangerous of access. The Rio de Aguas Calientes runs towards the north-east, and becomes, near the coast, a considerable river, swarming with great crocodiles, and contributing, by its inundations, to the insalubrity of the shore.
We descended towards Porto Cabello, having constantly the river of hot water on our right. The road is extremely picturesque, and the waters roll down on the shelves of rock. We might have fancied we were gazing on the cascades of the Reuss, that flows down Mount St. Gothard; but what a contrast in the vigour and richness of the vegetation! The white trunks of the cecropia rise majestically amid bignonias and melastomas. They do not disappear till we are within a hundred toises above the level of the ocean. A small thorny palm-tree extends also to this limit; the slender pinnate leaves of which look as if they had been curled toward the edges. This tree is very common in these mountains; but not having seen either its fruit or its flowers, we are ignorant whether it be the piritu palm-tree of the Caribbees, or the Cocos aculeata of Jacquin.
The rock on this road presents a geological phenomenon, the more remarkable as the existence of real stratified granite has long been disputed. Between La Trinchera and the Hato de Cambury a coarse-grained granite appears, which, from the disposition of the spangles of mica, collected in small groups, scarcely admits of confounding with gneiss, or with rocks of a schistose texture. This granite, divided into ledges of two or three feet thick, is directed 52 degrees north-east, and slopes to the north-west regularly at an angle of from 30 or 40 degrees. The feldspar, crystallized in prisms with four unequal sides, about an inch long, passes through every variety of tint from a flesh-red to yellowish white. The mica, united in hexagonal plates, is black, and sometimes green. The quartz predominates in the mass; and is generally of a milky white. I observed neither hornblende, black schorl, nor rutile titanite, in this granite. In some ledges we recognised round masses, of a blackish gray, very quartzose, and almost destitute of mica. They are from one to two inches diameter; and are found in every zone, in all granite mountains. These are not imbedded fragments, as at Greiffenstein in Saxony, but aggregations of particles which seem to have been subjected to partial attractions. I could not follow the line of junction of the gneiss and granitic formations. According to angles taken in the valleys of Aragua, the gneiss appears to descend below the granite, which must consequently be of a more recent formation. The appearance of a stratified granite excited my attention the more, because, having had the direction of the mines of Fichtelberg in Franconia for several years, I was accustomed to see granites divided into ledges of three or four feet thick, but little inclined, and forming masses like towers, or old ruins, at the summit of the highest mountains.* (* At Ochsenkopf, at Rudolphstein, at Epprechtstein, at Luxburg, and at Schneeberg. The dip of the strata of these granites of Fichtelberg is generally only from 6 to 10 degrees, rarely (at Schneeberg) 18 degrees. According to the dips I observed in the neighbouring strata of gneiss and mica-slate, I should think that the granite of Fichtelberg is very ancient, and serves as a basis for other formations; but the strata of grunstein, and the disseminated tin-ore which it contains, may lead us to doubt its great antiquity, from the analogy of the granites of Saxony containing tin.)
The heat became stifling as we approached the coast. A reddish vapour veiled the horizon. It was near sunset, and the breeze was not yet stirring. We rested in the lonely farms known under the names of the Hato de Cambury and the house of the Canarian (Casa del Isleno). The river of hot water, along the banks of which we passed, became deeper. A crocodile, more than nine feet long, lay dead on the strand. We wished to examine its teeth, and the inside of its mouth; but having been exposed to the sun for several weeks, it exhaled a smell so fetid that we were obliged to relinquish our design and remount our horses. When we arrived at the level of the sea, the road turned eastward, and crossed a barren shore a league and a half broad, resembling that of Cumana. We there found some scattered cactuses, a sesuvium, a few plants of Coccoloba uvifera, and along the coast some avicennias and mangroves. We forded the Guayguaza and the Rio Estevan, which, by their frequent overflowing, form great pools of stagnant water. Small rocks of meandrites, madrepores, and other corals, either ramified or with a rounded surface, rise in this vast plain, and seem to attest the recent retreat of the sea. But these masses, which are the habitations of polypi, are only fragments imbedded in a breccia with a calcareous cement. I say a breccia, because we must not confound the fresh and white corallites of this very recent littoral formation, with the corallites blended in the mass of transition-rocks, grauwacke, and black limestone. We were astonished to find in this uninhabited spot a large Parkinsonia aculeata loaded with flowers. Our botanical works indicate this tree as peculiar to the New World; but during five years we saw it only twice in a wild state, once in the plains of the Rio Guayguaza, and once in the llanos of Cumana, thirty leagues from the coast, near la Villa del Pao, but there was reason to believe that this latter place had once been a conuco, or cultivated enclosure. Everywhere else on the continent of America we saw the Parkinsonia, like the Plumeria, only in the gardens of the Indians.
At Porto Cabello, as at La Guayra, it is disputed whether the port lies east or west of the town, with which the communications are the most frequent. The inhabitants believe that Porto Cabello is north-north-west of Nueva Valencia; and my observations give a longitude of three or four minutes more towards the west.
We were received with the utmost kindness in the house of a French physician, M. Juliac, who had studied medicine at Montpelier. His small house contained a collection of things the most various, but which were all calculated to interest travellers. We found works of literature and natural history; notes on meteorology; skins of the jaguar and of large aquatic serpents; live animals, monkeys, armadilloes, and birds. Our host was principal surgeon to the royal hospital of Porto Cabello, and was celebrated in the country for his skilful treatment of the yellow fever. During a period of seven years he had seen six or eight thousand persons enter the hospitals, attacked by this cruel malady. He had observed the ravages that the epidemic caused in Admiral Ariztizabal's fleet, in 1793. That fleet lost nearly a third of its men; for the sailors were almost all unseasoned Europeans, and held unrestrained intercourse with the shore. M. Juliac had heretofore treated the sick as was commonly practised in Terra Firma, and in the island, by bleeding, aperient medicines, and acid drinks. In this treatment no attempt was made to raise the vital powers by the action of stimulants, so that, in attempting to allay the fever, the languor and debility were augmented. In the hospitals, where the sick were crowded, the mortality was often thirty-three per cent among the white Creoles; and sixty-five in a hundred among the Europeans recently disembarked. Since a stimulant treatment, the use of opium, of benzoin, and of alcoholic draughts, has been substituted for the old debilitating method, the mortality has considerably diminished. It was believed to be reduced to twenty in a hundred among Europeans, and ten among Creoles;* even when black vomiting, and haemorrhage from the nose, ears, and gums, indicated a high degree of exacerbation in the malady. (* I have treated in another work of the proportions of mortality in the yellow fever. (Nouvelle Espagne volume 2 pages 777, 785, and 867.) At Cadiz the average mortality was, in 1800, twenty per cent; at Seville, in 1801, it amounted to sixty per cent. At Vera Cruz the mortality does not exceed twelve or fifteen per cent, when the sick can be properly attended. In the civil hospitals of Paris the number of deaths, one year with another, is from fourteen to eighteen per cent; but it is asserted that a great number of patients enter the hospitals almost dying, or at very advanced time of life.) I relate faithfully what was then given as the general result of observation: but I think, in these numerical comparisons, it must not be forgotten, that, notwithstanding appearances, the epidemics of several successive years do not resemble each other; and that, in order to decide on the use of fortifying or debilitating remedies, (if indeed this difference exist in an absolute sense,) we must distinguish between the various periods of the malady.
The climate of Porto Cabello is less ardent than that of La Guayra. The breeze there is stronger, more frequent, and more regular. The houses do not lean against rocks that absorb the rays of the sun during the day, and emit caloric at night, and the air can circulate more freely between the coast and the mountains of Ilaria. The causes of the insalubrity of the atmosphere must be sought in the shores that extend to the east, as far as the eye can reach, towards the Punta de Tucasos, near the fine port of Chichiribiche. There are situated the salt-works; and there, at the beginning of the rainy season, tertian fevers prevail, and easily degenerate into asthenic fevers. It is affirmed that the mestizoes who are employed in the salt-works are more tawny, and have a yellower skin, when they have suffered several successive years from those fevers, which are called the malady of the coast. The poor fishermen, who dwell on this shore, are of opinion that it is not the inundations of the sea, and the retreat of the salt-water, which render the lands covered with mangroves so unhealthful;* (* In the West India Islands all the dreadful maladies which prevail during the wintry season, have been for a long time attributed to the south winds. These winds convey the emanations of the mouths of the Orinoco and of the small rivers of Terra Firma toward the high latitudes.) they believe that the insalubrity of the air is owing to the fresh water, that is, to the overflowings of the Guayguaza and Estevan, the swell of which is so great and sudden in the months of October and November. The banks of the Rio Estevan have been less insalubrious since little plantations of maize and plantains have been established; and, by raising and hardening the ground, the river has been confined within narrower limits. A plan is formed of giving another issue to the Rio San Estevan, and thus to render the environs of Porto Cabello more wholesome. A canal is to lead the waters toward that part of the coast which is opposite the island of Guayguaza.
The salt-works of Porto Cabello somewhat resemble those of the peninsula of Araya, near Cumana. The earth, however, which they lixivate by collecting the rain-water into small basins, contains less salt. It is questioned here, as at Cumana, whether the ground be impregnated with saline particles because it has been for ages covered at intervals with sea-water evaporated by the heat of the sun, or whether the soil be muriatiferous, as in a mine very poor in native salt. I had not leisure to examine this plain with the same attention as the peninsula of Araya. Besides, does not this problem reduce itself to the simple question, whether the salt be owing to new or very ancient inundations? The labouring at the salt-works of Porto Cabello being extremely unhealthy, the poorest men alone engage in it. They collect the salt in little stores, and afterwards sell it to the shopkeepers in the town.
During our abode at Porto Cabello, the current on the coast, generally directed towards the west,* ran from west to east. This upward current (corriente por arriba), is very frequent during two or three months of the year, from September to November. It is believed to be owing to some north-west winds that have blown between Jamaica and Cape St. Antony in the island of Cuba. (* The wrecks of the Spanish ships, burnt at the island of Trinidad, at the time of its occupation by the English in 1797, were carried by the general or rotary current to Punta Brava, near Porto Cabello. This general current toward the east, from the coasts of Paria to the isthmus of Panama and the western extremity of the island of Cuba, was the subject of a violent dispute between Don Diego Columbus, Oviedo, and the pilot Andres, in the sixteenth century.)