With this the young man shook hands with the operator, and left the office.

"There!" exclaimed the other, looking after him with a relieved sigh; "I believe I have done that young fellow a good turn. At the same time I have given myself a chance to capture the thousand-dollar reward that Ned wrote about, and which I was afraid this chap was after for himself."

As for Billy Brackett, the more he reflected upon the situation, as he hastened towards the place where the raft was moored, the more puzzled he became as to what course he ought to pursue. He now had not only Winn, the raft, and himself to consider, but Glen and Binney, and the valuable instruments belonging to General Elting. Certainly it would not do to allow these to fall into the hands of an excited and irresponsible mob. Still, the thought of running away was hateful.

As he neared the raft an undefined apprehension caused him to quicken his steps; and at the sound of Binney Gibbs's shout of warning, he broke into a run. Then he heard another shout of "Hol' on, Marse Winn! I comin'!" and the noise of a struggle, in another moment he was in the thick of it.

Solon had reached the raft just in time to save Binney, who he thought was Winn, from being dropped overboard by Plater, the "river-trader." The old negro attacked the big man so furiously with tooth and nail that the latter gave the lad in his arms a fling to one side, sending him crashing with stunning force against the "shanty," and devoted his entire attention to this new assailant. He had just stretched Solon on the deck with a vicious blow of his powerful fist, when Billy Brackett appeared and sprang eagerly into the fray. Even Plater's brute strength was no match for the young engineer's science, and the latter would have gained a speedy victory, had not Grimshaw, who had been engaged in casting off the lines that held the raft to the bank, come to his partner's assistance.

Now, with such odds against him, Billy Brackett was slowly but surely forced backward towards the edge of the raft. In another moment he would have been in the river, when all at once two dripping figures emerged from it, scrambled aboard, and with a yell like a war-whoop, ranged themselves on the weaker side. A few well-planted blows, a determined rush, and the struggle for the possession of the raft was ended. The fighting ardor of Messrs. Plater and Grimshaw was being rapidly cooled in the icy waters through which they found themselves swimming towards the shore. At the same time the Venture was gaining speed with each moment, as, borne on by the resistless current, it drifted out over the mingling floods of the Ohio and Mississippi. Billy Brackett, still panting from his exertions, was bending over Binney Gibbs, who was struggling back to consciousness. Solon was sitting up, tenderly feeling of his swollen features, and declaring, "Dat ar man hab a fis' lak de hin laig ob a mewel."

Glen and Winn had manned one of the sweeps, and were trying to get the raft properly headed with the current. Thus the voyage was really begun, and the young engineer, who hated to run away, was spared the necessity of making a decision. It was a start, too, with all hands on board. To be sure, two of them were battered and bruised, while two more were soaked to the skin; but all were there, and none was greatly the worse for the recent exciting experience.

Suddenly Billy Brackett spoke up and asked:

"But where is Bim? Is it possible that we have left him behind?"

For a moment no one answered. Then Winn said: "That's what Glen and I were ashore for. We are afraid he is lost."