The first of these was--and this was a question of life or death--that this proof of Joam Dacosta's innocence must be produced before the arrival of the order from Rio Janeiro. Once the identity of the prisoner was established, it was impossible that such an order could be other than the order for his execution.

The second was that the body of Torres should be got out of the water as quickly as possible so as to regain undamaged the metal case and the paper it ought to contain.

At this juncture Araujo displayed not only zeal and intelligence, but also a perfect knowledge of the state of the river at its confluence with the Rio Negro.

"If Torres," he said to the young men, "had been from the first carried away by the current, we should have to drag the river throughout a large area, for we shall have a good many days to wait for his body to reappear on the surface through the effects of decomposition."

"We cannot do that," replied Manoel. "This very day we ought to succeed."

"If, on the contrary," continued the pilot, "the corpse has got stuck among the reeds and vegetation at the foot of the bank, we shall not be an hour before we find it."

"To work, then!" answered Benito.

There was but one way of working. The boats approached the bank, and the Indians, furnished with long poles, began to sound every part of the river at the base of the bluff which had served for the scene of combat.

The place had been easily recognized. A track of blood stained the declivity in its chalky part, and ran perpendicularly down it into the water; and there many a clot scattered on the reeds indicated the very spot where the corpse had disappeared.

About fifty feet down stream a point jutted out from the riverside and kept back the waters in a kind of eddy, as in a large basin. There was no current whatever near the shore, and the reeds shot up out of the river unbent. Every hope then existed that Torres' body had not been carried away by the main stream. Where the bed of the river showed sufficient slope, it was perhaps possible for the corpse to have rolled several feet along the ridge, and even there no effect of the current could be traced.

The ubas and the pirogues, dividing the work among them, limited the field of their researches to the extreme edge of the eddy, and from the circumference to the center the crews' long poles left not a single point unexplored. But no amount of sounding discovered the body of the adventurer, neither among the clumps of reeds nor on the bottom of the river, whose slope was then carefully examined.

Two hours after the work had begun they had been led to think that the body, having probably struck against the declivity, had fallen off obliquely and rolled beyond the limits of this eddy, where the action of the current commenced to be felt.

"But that is no reason why we should despair," said Manoel, "still less why we should give up our search."

"Will it be necessary," exclaimed Benito, "to search the river throughout its breadth and its length?"

"Throughout its breadth, perhaps," answered Araujo, "throughout its length, no--fortunately."

"And why?" asked Manoel.

"Because the Amazon, about a mile away from its junction with the Rio Negro, makes a sudden bend, and at the same time its bed rises, so that there is a kind of natural barrier, well known to sailors as the Bar of Frias, which things floating near the surface are alone able to clear. In short, the currents are ponded back, and they cannot possibly have any effect over this depression."

This was fortunate, it must be admitted. But was Araujo mistaken? The old pilot of the Amazon could be relied on. For the thirty years that he had followed his profession the crossing of the Bar of Frias, where the current was increased in force by its decrease in depth, had often given him trouble. The narrowness of the channel and the elevation of the bed made the passage exceedingly difficult, and many a raft had there come to grief.

And so Araujo was right in declaring that if the corpse of Torres was still retained by its weight on the sandy bed of the river, it could not have been dragged over the bar.