They had been on the look-out for some time for a good camping-place, as it was their usual hour to stop. No opening, however, appeared for several miles. The banks on both sides were thickly-wooded to the river’s edge, and the branches of the trees even drooped into the water. At length they came in sight of a natural raft that had been formed by drift-wood in a bend of the stream; and as the logs lay thickly together, and even piled upon each other, it appeared an excellent place to encamp on. It was, at all events, better than to attempt to penetrate the thick jungles which met them everywhere else; and so the balza was directed towards the raft, and soon floated alongside it.

They had already got ashore on the raft, which was dry and firm, and would have served their purpose well enough; when, all at once, Guapo was heard uttering one of those exclamations, which showed that all was not right. The rest looked towards him for an explanation. He was standing by the edge of the floating timber, just where the balza touched it, with his arms stretched out in an attitude that betokened trouble. They all ran up. They saw what was the matter at a glance. Thousands of red ants were climbing from the raft to the balza! Thousands,—nay, it would be nearer the truth to say millions!

At one glance Don Pablo saw that it would be a terrible calamity, should these creatures gain a lodgment on the balza. Not only were they the dreaded stinging ants, but in a short time nothing on board would be left. In a few hours they would have eaten all his stores,—his bark, his vanilla, and his roots. Already quite a number had got upon the canoe, and were crossing it toward the body of the balza.

Without saying another word, he ordered all to get on board as quickly as possible, each taking some utensil that had already been carried on shore. He and Guapo flew to the poles; and, having hastily unfastened and drawn in the cable, they pushed the balza out into the stream. Then while Guapo managed the great oar, Don Pablo, assisted by Leon and by Doña Isidora, went to work with scoops and pails, dashing water upon the ants; until every one of them had disappeared, drowned in the canoe or washed off into the river. Fortunate for them, they had observed this strange enemy in time. Had they not done so—in other words, had they gone to sleep, leaving the balza where it was during the night—they would have awakened in the morning to find their stores completely destroyed, their labour of a year brought to nothing in the space of a single night. This is no uncommon occurrence to the merchant or the colonist of tropical America.

They had made a narrow escape, but a fortunate one. They were not without their troubles, however. No open ground could be found for miles below; and, as it was growing dark, they approached the thickly-wooded bank; and, after a good deal of scratching among the branches, at length succeeded in making the cable fast to a tree. The balza then swung round, and floated at the end of the cable, half of it being buried under the long hanging branches.

They spent their night on board, for it was no use attempting to get on shore through the underwood; and even if they had, they could not have encamped very comfortably in a thicket. On the other hand, the balza did not afford the best accommodation for sleeping. The little “toldo,” or cabin, was not large enough to swing a hammock in. It would only contain a few persons seated close together; and it had been built more for the purpose of keeping the sun off during the hot hours of the day than for sleeping in. The rest of the balza was occupied with the freight; and this was so arranged with sloping sides, thatched with the bussu-leaves, that there was no level place where one could repose upon it. The night, therefore, was passed without very much sleep having been obtained by any one of the party. Of course, the moment the first streaks of day began to appear along the Eastern sky, they were all awake and ready to leave their disagreeable anchorage.

As they were making preparations to untie the cable, they noticed that just below where the balza lay, a horizontal limb stretched far out over the river. It was the lowermost limb of a large zamang-tree, that stood on the bank close to the edge of the water. It was not near the surface, but a good many feet above. Still it was not certain that it was high enough for the roof of the toldo to clear it. That was an important question; for although the current was not very rapid just there, it was sufficiently so to carry the balza under this branch before they could push it out into the stream. Once the cable was let go, they must inevitably pass under the limb of the zamang; and if that caught the toldo, it would sweep off the frail roof like so much spider’s-web. This would be a serious damage; and one to be avoided, if possible.

Don Pablo and Guapo went to the end of the balza nearest the branch, and stood for some time surveying it. It was about eight or ten yards distant; but in the grey dawn they could not judge correctly of its height, and they waited till it grew a little clearer. At length they came to the conclusion that the branch was high enough. The long pendulous leaves—characteristic of this great mimosa—and the drooping branchlets hung down much below the main shaft; but these, even if they touched the roof, would do no injury. It was, therefore, determined to let go the cable.

It was now clear day, for they had been delayed a good while; but at length all was ready, and Guapo untied the cable, and drew the end on board. The balza began to move; slowly at first, for the current under the bushes was very slight.

All at once the attention of the voyagers was called to the strange conduct of the pet monkey. That little creature was running to and fro, first upon the roof of the toldo, then down again, all the while uttering the most piercing shrieks as if something was biting off its tail! It was observed to look forward and upward toward the branch of the zamang, as if the object it dreaded was in that quarter. The eyes of all were suddenly bent in the same direction. What was their horror on beholding, stretched along the branch, the hideous body of an enormous serpent! Only part of it could be seen; the hinder half and the tail were hidden among the bromelias and vines that in huge masses clustered around the trunk of the zamang, and the head was among the leaflets of the mimosa; but what they saw was enough to convince them that it was a snake of the largest size—the great “water-boa”—the anaconda!