Meanwhile the “row,” as Earle had observed, seemed to be growing worse than ever, and it was presently added to by the low mutterings of distant thunder, the precursor of what threatened to be a thunderstorm of unusual violence. The flickering of sheet lightning became more frequent, while occasional flashes of forked lightning emanating from a point low down upon the south-western horizon, began to light up the surroundings for a fraction of a second with their transient glare. Soon low moaning sounds became fitfully audible far aloft, and little scurrying gusts of hot wind came sweeping across the lagoon, causing the fire on the knoll to roar and blaze with sudden intensity, while the sparks flew far inland.

“Stand by the topsail halliards!” remarked Dick, with a grin. “We are going to have it hot and heavy in a minute or two, or I’m a Dutchman!” And the words were hardly out of his mouth when, with a shrieking roar, the tempest swooped down upon them, and they abruptly sat down, to avoid being swept off their feet, while the blazing embers of the fire, snatched up by the wind, went whirling far and wide. At the same instant a flash of blindingly vivid lightning leapt from the zenith and seemed to strike the waters of the lagoon only a few yards away, while simultaneously there came a crash of thunder that caused their ears to ring and tingle, and effectually deafened them for several minutes. This was the outburst of the storm, which thereafter raged with indescribable fury for a full hour, the lightning incessantly flashing all round the little knoll with such dazzling brilliancy that the entire landscape, almost to its uttermost confines, was nearly as fully revealed as at noonday, while the thunder crashed and rattled and boomed with a nerve-shattering violence that effectually drowned all other sounds. And, to add still further to the weird impressiveness of the scene, the storm had scarcely been raging ten minutes when the swamp was seen to be on fire in several places immediately to leeward of the knoll, the dry herbage having been undoubtedly kindled by the flying embers and sparks of the fire, which had been completely swept away by the wind. For the first half-hour of its duration the storm was a dry one, that is to say, it was unaccompanied by rain; and while the tempest raged about them Dick and Earle lay prone, side by side, watching the marvellous scene revealed by the incessant lightning flashes. And Earle afterwards confided to Dick—and, still later, to many others—that what he then beheld more than repaid him for all that the entire journey cost him, not only in money, but also in toil and privation. For although the flickering of the lightning and its almost blinding vividness were by no means conducive to accuracy of observation, he saw enough to fully confirm his previous conviction that the swamp was the habitat of several forms of life hitherto unknown and unsuspected by naturalists. True, most of the creatures seen were apparently amphibious, their forms only partially revealed as they sported or fought in the waters of the lagoon; but transient glimpses were occasionally caught of others roaming about the patches of dry ground; while all were too distant for the watchers to obtain any very clear impression of their shapes and proportions. Then the wind and the lightning suddenly ceased, pitchy darkness fell upon the scene, and the rain descended in such a deluge as is known only to those who have dwelt in the tropics, lasting until within half-an-hour of sunrise.

The appearance of the sun was hailed with feelings of unqualified delight by the entire party, for not only did the remaining clouds vanish with his uprising, but he brought what was, for once, welcome warmth with him, to the relief of the drenched and thoroughly chilled occupants of the camp, who had lain exposed for hours to the pitiless pelting of the rain—Dick and Earle suffering equally with the rest, the wind having temporarily wrecked their tent. They felt that a hot breakfast would have been indescribably welcome that morning; but such a meal was impossible, for the rain had saturated everything and rendered a fire out of the question; they were consequently obliged to content themselves with cold viands, which they consumed in haste, for they had the prospect of a busy day before them.

The problem which confronted them was, how were they to transport themselves and their belongings across the lagoon? For it was on the opposite side of it that their road lay, and if they would proceed, only two alternatives seemed open to them; one to find some means by which they could ferry themselves across, while the other was to pass round one or the other of the extremities of the lagoon. And this last meant the retracing of their steps for a considerable distance, with the prospect of a long march to follow, the lagoon extending to right and left as far as the eye could see.

It was at this crisis that Huanami, one of the bearers, a Peruvian half-breed, came to the rescue with a suggestion. During the march of the previous day, this man, it appeared, had taken note of vast quantities of a particular kind of reed growing some three or four miles back, upon the opposite side of a canal-like watercourse, along the margin of which the party had been travelling, and he was of opinion that those reeds could be used in the construction of excellent balsas, if they could only be got at. And he believed that it would be possible to get at them if the white lords would permit him and two or three of his comrades to go still further back to a point where, on the near side of the canal, he had noted a sufficient growth of reeds to construct a single balsa of a capacity which would enable him to float himself across the canal to the opposite side, where the reeds were growing in profusion. The suggestion found immediate favour with the “white lords,” for it appeared to indicate the shortest way out of the difficulty; and orders were at once given to carry it into effect.

But Earle made one important modification in Huanami’s proposal. After the experiences of the previous day—and, still more, of the past night—he was not at all disposed to permit two or three unarmed men to retrace their steps, unaccompanied, with the possibility that they might be set upon and destroyed by some unknown monster inhabitant of the swamp; he therefore gave orders for the entire party to countermarch, and five minutes later they were under way.

Somewhere about an hour later they reached the spot where the rushes grew on the opposite side of the canal; and it was at once apparent that there was a sufficiency to meet the requirements of the party; while at a further distance of about a mile they came to a bed containing enough rashes to construct a balsa capable of supporting a single man, or possibly two men. Huanami cut one of the rushes for Earle’s inspection, and dividing it up into short lengths, showed that it was a bamboo-like growth, hollow in structure and divided into a series of watertight compartments by partitions occurring at every notch, rendering it exceedingly light and buoyant. The average length of the rushes was about twelve feet, but by a kind of interlacing system a raft, or balsa, of almost any required dimensions could be constructed.

No time was lost by the party in getting to work upon the first balsa, Huanami cutting great quantities of long, tough bents and plaiting them up into a kind of rope, while the rest of the Indians cut the reeds. It was necessary for them to get into the water to do this; but luckily, the reeds first attacked grew in shallow water, only up to the men’s knees, and while they all worked together, shouting and splashing vigorously the while, Dick and Earle, armed with repeating rifles, mounted guard on the bank, holding themselves ready to open fire upon any marauding alligator or other creature that might threaten to interrupt the work. No interruption occurred, however, and in less than an hour the reeds were all cut and the construction of the first balsa was begun. Huanami proved himself an adept in the art of balsa construction, and when noon arrived, and with it the hour for the mid-day meal, the first balsa was complete and ready for service, including a pair of paddles, also ingeniously made of reeds.

When at the conclusion of the meal the balsa came to be tried, it was found to possess buoyancy enough to carry two men safely and comfortably; the return march along the bank to the spot where the remainder of the fleet was to be built was therefore immediately commenced, the builder and his load of impedimenta proceeding by water at the same time. The balsa, it may here be explained, was a very simple affair indeed, consisting merely of a flat bundle of reeds, firmly bound together in such a way as to form a sort of raft. The one already built was about ten feet long and about five feet broad, by about a foot in depth; but while strong enough for its purpose, it was, after all, very light, and quite capable of being capsized should an enterprising alligator take it into his head to attack it; during the short march to the big reed bed, therefore, Dick and Earle decided that the next balsa should be constructed of a capacity to accommodate the entire party, and therefore be heavy and bulky enough to resist anything short of a concerted attack by a herd of alligators. The construction of such a craft was of course a somewhat formidable undertaking, though the other Indians showed themselves apt pupils of Huanami, and the task was only completed when the sun had already disappeared and darkness was closing down upon the scene.

On the following morning the voyage across the lagoon was begun immediately after breakfast, and accomplished not only without mishap but without adventure of any kind; for, strangely enough, not one of the creatures which had been observed disporting themselves in the water during the preceding night was now visible; indeed, so far as appearances went, there might not even have been so much as a fish in the lagoon. A sharp look-out was maintained for the beast that had been shot at during the night, but neither alive or dead was anything seen of him. One fact, however, was established during the passage across, and that was, that the depth of water in the lagoon was far greater than had hitherto been suspected, a depth of no less than thirty fathoms being found nearly all the way across except quite close to the margin.