The horses were spurred on to the utmost, and Thaouka led the way, bounding over the water as if it had been his natural element. Certainly he might justly have been called a sea-horse--better than many of the amphibious animals who bear that name.

All of a sudden, about ten in the morning, Thaouka betrayed symptoms of violent agitation. He kept turning round toward the south, neighing continually, and snorting with wide open nostrils. He reared violently, and Thalcave had some difficulty in keeping his seat. The foam from his mouth was tinged with blood from the action of the bit, pulled tightly by his master's strong hand, and yet the fiery animal would not be still. Had he been free, his master knew he would have fled away to the north as fast as his legs would have carried him.

"What is the matter with Thaouka?" asked Paganel. "Is he bitten by the leeches? They are very voracious in the Argentine streams."

"No," replied the Indian.

"Is he frightened at something, then?"

"Yes, he scents danger."

"What danger?"

"I don't know."

But, though no danger was apparent to the eye, the ear could catch the sound of a murmuring noise beyond the limits of the horizon, like the coming in of the tide. Soon a confused sound was heard of bellowing and neighing and bleating, and about a mile to the south immense flocks appeared, rushing and tumbling over each other in the greatest disorder, as they hurried pell-mell along with inconceivable rapidity. They raised such a whirlwind of water in their course that it was impossible to distinguish them clearly. A hundred whales of the largest size could hardly have dashed up the ocean waves more violently.

"_Anda, anda!_" (quick, quick), shouted Thalcave, in a voice like thunder.

"What is it, then?" asked Paganel.

"The rising," replied Thalcave.

"He means an inundation," exclaimed Paganel, flying with the others after Thalcave, who had spurred on his horse toward the north.

It was high time, for about five miles south an immense towering wave was seen advancing over the plain, and changing the whole country into an ocean. The tall gra.s.s disappeared before it as if cut down by a scythe, and clumps of mimosas were torn up and drifted about like floating islands.

The wave was speeding on with the rapidity of a racehorse, and the travelers fled before it like a cloud before a storm-wind. They looked in vain for some harbor of refuge, and the terrified horses galloped so wildly along that the riders could hardly keep their saddles.

"_Anda, anda!_" shouted Thalcave, and again they spurred on the poor animals till the blood ran from their lacerated sides. They stumbled every now and then over great cracks in the ground, or got entangled in the hidden gra.s.s below the water. They fell, and were pulled up only to fall again and again, and be pulled up again and again. The level of the waters was sensibly rising, and less than two miles off the gigantic wave reared its crested head.

For a quarter of an hour this supreme struggle with the most terrible of elements lasted. The fugitives could not tell how far they had gone, but, judging by the speed, the distance must have been considerable.

The poor horses, however, were breast-high in water now, and could only advance with extreme difficulty. Glenarvan and Paganel, and, indeed, the whole party, gave themselves up for lost, as the horses were fast getting out of their depth, and six feet of water would be enough to drown them.

It would be impossible to tell the anguish of mind these eight men endured; they felt their own impotence in the presence of these cataclysms of nature so far beyond all human power. Their salvation did not lie in their own hands.

Five minutes afterward, and the horses were swimming; the current alone carried them along with tremendous force, and with a swiftness equal to their fastest gallop; they must have gone fully twenty miles an hour.

All hope of delivery seemed impossible, when the Major suddenly called out:

"A tree!"

"A tree?" exclaimed Glenarvan.

"Yes, there, there!" replied Thalcave, pointing with his finger to a species of gigantic walnut-tree, which raised its solitary head above the waters.

His companions needed no urging forward now; this tree, so opportunely discovered, they must reach at all hazards. The horses very likely might not be able to get to it, but, at all events, the men would, the current bearing them right down to it.

Just at that moment Tom Austin's horse gave a smothered neigh and disappeared. His master, freeing his feet from the stirrups, began to swim vigorously.

"Hang on to my saddle," called Glenarvan.

"Thanks, your honor, but I have good stout arms."

"Robert, how is your horse going?" asked his Lordship, turning to young Grant.

"Famously, my Lord, he swims like a fish."

"Lookout!" shouted the Major, in a stentorian voice.

The warning was scarcely spoken before the enormous billow, a monstrous wave forty feet high, broke over the fugitives with a fearful noise. Men and animals all disappeared in a whirl of foam; a liquid ma.s.s, weighing several millions of tons, engulfed them in its seething waters.

When it had rolled on, the men reappeared on the surface, and counted each other rapidly; but all the horses, except Thaouka, who still bore his master, had gone down forever.

"Courage, courage," repeated Glenarvan, supporting Paganel with one arm, and swimming with the other.

"I can manage, I can manage," said the worthy savant. "I am even not sorry--"

But no one ever knew what he was not sorry about, for the poor man was obliged to swallow down the rest of his sentence with half a pint of muddy water. The Major advanced quietly, making regular strokes, worthy of a master swimmer. The sailors took to the water like porpoises, while Robert clung to Thaouka's mane, and was carried along with him. The n.o.ble animal swam superbly, instinctively making for the tree in a straight line.

The tree was only twenty fathoms off, and in a few minutes was safely reached by the whole party; but for this refuge they must all have perished in the flood.

The water had risen to the top of the trunk, just to where the parent branches fork out. It was consequently, quite easy to clamber up to it.

Thalcave climbed up first, and got off his horse to hoist up Robert and help the others. His powerful arms had soon placed all the exhausted swimmers in a place of security.

But, meantime, Thaouka was being rapidly carried away by the current.

He turned his intelligent face toward his master, and, shaking his long mane, neighed as if to summon him to his rescue.

"Are you going to forsake him, Thalcave?" asked Paganel.

"I!" replied the Indian, and forthwith he plunged down into the tumultuous waters, and came up again ten fathoms off. A few instants afterward his arms were round Thaouka's neck, and master and steed were drifting together toward the misty horizon of the north.

CHAPTER XXIII A SINGULAR ABODE

THE tree on which Glenarvan and his companions had just found refuge, resembled a walnut-tree, having the same glossy foliage and rounded form. In reality, however, it was the OMBU, which grows solitarily on the Argentine plains. The enormous and twisted trunk of this tree is planted firmly in the soil, not only by its great roots, but still more by its vigorous shoots, which fasten it down in the most tenacious manner. This was how it stood proof against the shock of the mighty billow.

This...o...b.. measured in height a hundred feet, and covered with its shadow a circ.u.mference of one hundred and twenty yards. All this scaffolding rested on three great boughs which sprang from the trunk. Two of these rose almost perpendicularly, and supported the immense parasol of foliage, the branches of which were so crossed and intertwined and entangled, as if by the hand of a basket-maker, that they formed an impenetrable shade. The third arm, on the contrary, stretched right out in a horizontal position above the roaring waters, into which the lower leaves dipped. There was no want of room in the interior of this gigantic tree, for there were great gaps in the foliage, perfect glades, with air in abundance, and freshness everywhere. To see the innumerable branches rising to the clouds, and the creepers running from bough to bough, and attaching them together while the sunlight glinted here and there among the leaves, one might have called it a complete forest instead of a solitary tree sheltering them all.

On the arrival of the fugitives a myriad of the feathered tribes fled away into the topmost branches, protesting by their outcries against this flagrant usurpation of their domicile. These birds, who themselves had taken refuge in the solitary OMBU, were in hundreds, comprising blackbirds, starlings, isacas, HILGUEROS, and especially the pica-flor, humming-birds of most resplendent colors. When they flew away it seemed as though a gust of wind had blown all the flowers off the tree.

Such was the asylum offered to the little band of Glenarvan. Young Grant and the agile Wilson were scarcely perched on the tree before they had climbed to the upper branches and put their heads through the leafy dome to get a view of the vast horizon. The ocean made by the inundation surrounded them on all sides, and, far as the eye could reach, seemed to have no limits. Not a single tree was visible on the liquid plain; the OMBU stood alone amid the rolling waters, and trembled before them.

In the distance, drifting from south to north, carried along by the impetuous torrent, they saw trees torn up by the roots, twisted branches, roofs torn off, destroyed RANCHOS, planks of sheds stolen by the deluge from ESTANCIAS, carca.s.ses of drowned animals, blood-stained skins, and on a shaky tree a complete family of jaguars, howling and clutching hold of their frail raft. Still farther away, a black spot almost invisible, already caught Wilson's eye. It was Thalcave and his faithful Thaouka.

"Thalcave, Thalcave!" shouted Robert, stretching out his hands toward the courageous Patagonian.