With a vigorous of the , Hercules had pushed toward the left bank. Besides, the current was not more rapid in that place, and the bed of the river kept its normal to the falls. As has been said, it was the sudden sinking of the ground, and the attraction was only felt three or four hundred feet above the .  
On the left bank were large and very thick trees. No light their impenetrable curtain. It was not without terror that Dick Sand looked at this territory, inhabited by the cannibals of the Lower Congo, which he must now cross, because the boat could no longer follow the stream. He could not dream of carrying it below the falls. It was a terrible blow for these poor people, on the eve perhaps of reaching the villages at its mouth. They were well aided, however. Would not Heaven come to their assistance?
 
The boat soon reached the left bank of the river. As it drew near,
Dingo gave strange marks of and grief at the same time.
Dick Sand, who was watching the animal—for all was danger—asked himself if some beast or some native was not in the high of the bank. But he soon saw that the animal was not by a sentiment of anger.
 
"One would say that Dingo was crying!" exclaimed little , clasping
Dingo in his two arms.
Dingo escaped from him, and, springing into the water, when the boat was only twenty feet from the bank, reached the shore and disappeared among the bushes.
 
Neither Mrs. Weldon, nor Dick Sand, nor Hercules, knew what to think.
 
They landed a few moments after in the middle of a green with hairweed and other plants. Some kingfishers, giving a sharp whistle, and some little herons, white as snow, immediately flew away. Hercules fastened the boat firmly to a , and all climbed up the steep bank overhung by large trees.
 
There was no path in this forest. However, faint traces on the ground indicated that this place had been recently visited by natives or animals.
 
Dick Sand, with loaded gun, and Hercules, with his in his hand, had not gone ten steps before they found Dingo again. The dog, nose to the ground, was following a , barking all the time. A first had the animal to this part of the shore, a second led it into the depths of the wood. That was clearly visible to all.
 
"Attention!" said Dick Sand. "Mrs. Weldon, Mr. Benedict, Jack, do not leave us! Attention, Hercules!"
 
At this moment Dingo raised its head, and, by little bounds, invited them to follow.
 
A moment after Mrs. Weldon and her companions rejoined it at the foot of an old sycamore, lost in the thickest part of the wood.
 
There was a dilapidated hut, with disjoined boards, before which Dingo was barking .
 
"Who can be there?" exclaimed Dick Sand.
 
He entered the hut.
 
Mrs. Weldon and the others followed him.
 
The ground was with bones, already under the discoloring action of the atmosphere.
 
"A man died in that hut!" said Mrs. Weldon.
 
"And Dingo knew that man!" replied Dick Sand. "It was, it must have been, his master! Ah, see!"
 
Dick Sand to the naked trunk of the sycamore at the end of the hut.
 
There appeared two large red letters, already almost , but which could be still .
 
Dingo had rested its right paw on the tree, and it seemed to indicate them.
 
"S. V.!" exclaimed Dick Sand. "Those letters which Dingo knew among all others! Those initials that it carries on its collar!"
 
He did not finish, and stooping, he picked up a little box, all oxydized, which lay in a corner of the hut.
 
That box was opened, and a of paper fell from it, on which Dick
Sand read these few words:
    "—robbed by my guide, Negoro—3d December,
    1871—here—120 miles from the coast—Dingo!—with me!
"S. VERNON."
The note told everything. Samuel Vernon set out with his dog, Dingo, to explore the center of Africa, guided by Negoro. The money which he carried had excited the 's , and he resolved to take possession of it. The French traveler, arrived at this point of the Congo's banks, had established his camp in this hut. There he was mortally wounded, robbed, abandoned. The murder , no doubt Negoro took to flight, and it was then that he fell into the hands of the Portuguese. Recognized as one of the trader Alvez's agents, conducted to Saint Paul de Loanda, he was to finish his days in one of the of the colony. We know that he succeeded in escaping, in reaching New Zealand, and how he on the "Pilgrim" to the misfortune of those who had taken passage on it. But what happened after the crime? Nothing but what was easy to understand! The unfortunate Vernon, before dying, had evidently had time to write the note which, with the date and the of the , gave the name of the assassin. This note he had shut up in that box where, doubtless, the stolen money was, and, in a last effort, his finger had traced like an epitaph the initials of his name. Before those two red letters, Dingo must have remained for many days! He had learned to know them! He could no longer forget them! Then, returned to the coast, the dog had been picked up by the captain of the "Waldeck," and finally, on board the "Pilgrim," found itself again with Negoro. During this time, the bones of the traveler were whitening in the depths of this lost forest of Central Africa, and he no longer lived except in the remembrance of his dog.
 
Yes, such must have been the way the events had happened. As Dick Sand and Hercules prepared to give a burial to the of Samuel Yernon, Dingo, this time giving a howl of rage, dashed out of the hut.
 
Almost at once horrible cries were heard at a short distance.
Evidently a man was struggling with the powerful animal.
Hercules did what Dingo had done. In his turn he sprang out of the hut, and Dick Sand, Mrs. Weldon, Jack, Benedict, following his steps, saw him throw himself on a man, who fell to the ground, held at the neck by the dog's formidable teeth.
 
It was Negoro.
 
In going to the mouth of the Zaire, so as to for America, this , leaving his escort behind, had come to the very place where he had assassinated the traveler who had trusted himself to him.
 
But there was a reason for it, and all understood it when they perceived some handfuls of French gold which glittered in a recently-dug hole at the foot of a tree. So it was evident that after the murder, and before falling into the hands of the Portuguese, Negoro had hidden the product of his crime, with the intention of returning some day to get it. He was going to take possession of this gold when Dingo him and sprang at his throat. The wretch, surprised, had drawn his cutlass and struck the dog at the moment when Hercules threw himself on him, crying:
 
"Ah, ! I am going to strangle you at last!"
 
There was nothing more to do. The Portuguese gave no sign of life, struck, it maybe said, by divine justice, and on the very spot where the crime had been committed. But the faithful dog had received a mortal blow, and dragging itself to the hut, it came to die there—where Samuel Vernon had died.
 
Hercules buried deep the traveler's remains, and Dingo, by all, was put in the same grave as its master.
 
Negoro was no more, but the natives who accompanied him from Kazounde could not be far away. On not seeing him return, they would certainly seek him along the river. This was a very serious danger.
 
Dick Sand and Mrs. Weldon took counsel as to what they should do, and do without losing an instant.
 
One fact acquired was that this stream was the Congo, which the natives call Kwango, or Ikoutouya Kongo, and which ............