The travellers thus happily saved may now proceed on their course, provided they have a supply of water for themselves, and have certain information of the existence of some deep pool at which their steeds may quench their thirst. Let them be cautious, however, how they approach the pool; for beneath its surface the alligator and anaconda lie hid, or the electric eel--which with its powerful galvanic battery may strike the steed which ventures within its reach. Even in this arid region the bountiful Creator has not left his creatures without the means of sustaining life. Here, on the driest soil, the globular melon-cactus, measuring a foot in diameter, flourishes; its tough and prickly skin surrounding a rich and juicy pulp. It is, however, covered with long, sharp thorns, which must be broken off before the refreshing juice can be obtained. It is curious that the wild horse and ox--strangers, as it were, to the region--are not possessed of the sagacity to do this; while the mule, when it discovers the melon, sets to work at once with its fore-feet, and then cautiously sips the refreshing liquid. Day after day the sun, with a lurid glare spread far and wide over the cloudless sky, rises above the arid plains, drawing up every particle of moisture, and withering with the intense heat of his rays every blade of grass and green leaf, till it seems as if the whole region were doomed to eternal desolation. At length, however, a wonderful change takes place over the hitherto arid waste. A thick veil of mist is drawn across the blue sky. A low bank of clouds appears on the horizon. Gradually it rises, assuming the form of distant mountain-chains above the plain. Onwards it advances, increasing in density, while vivid flashes of lightning dart forth; the thunder is heard rolling in the distance, and now loud crashing peals burst from the clouds, which rapidly spreading across the vault of heaven, plenteous showers rush downwards on the parched earth, filling up the dry cracks in the marshes, replenishing the pools, and swelling the streams. The grass springs up on every long-dry spot, the leaves burst forth, while thousands of flowers of every tint and hue enamel the plain; and, as if by magic, the whole face of nature is in a few hours changed. In a short time the thorny bushes of the delicate and feathery-foliaged mimosas are loaded with masses of canary-coloured blossoms, from their summits down to the lowest branches, sending forth an almost overpowering perfume; while the fronds of the beautiful mauritias--the palm of the Llanos--rising to the height of one hundred feet above the plain, sprout forth in rich luxuriance.