At last a brief exclamation from Leigh announced a discovery, and standing by his side, and looking directly across the chasm, Kenyon saw a curious, and in its way, a striking spectacle. From one side of the kloof to the other stretched the taut strands of a mighty double rope or hawser, and from this rope was suspended a small cage, capable of containing two or three men, the occupants drawing themselves across by small guide-ropes, whilst the cage moved easily along the hawser upon wheeled blocks, the whole arrangement being entirely concealed from the view of anyone, either above or below, by the trees on either side of the chasm, which at this point blended and interlaced both their foliage and their branches.

So far good, but as the cage now swung in mid-air over the very centre of the chasm itself, and had, moreover, an occupant, it was difficult to see what the next move was to be. It was, however, our friends reflected, at all events consoling to know that a slash or two with a sharp knife would effectually dispose of all possibility of their savage foes attacking them in the rear.

Just at this moment a cautious whistle told Kenyon that danger was to be apprehended from the direction of the veldt, but at that very instant the man in the cage, evidently thinking that the signal had been given for his benefit, commenced to haul upon the rope, and quickly gaining their side of the chasm, leaped out right into the ready arms of the pair, who very soon had him securely gagged and tied to a tree, at a little distance from his fellow. Hurrying back as another low but earnest whistle reached their ears, our friends found that the slavers had been seen to surround the tent, and thoroughly explore it; then, evidently disliking the look of things, they had set out at speed towards the pass, which they must now be in the very act of climbing.

Carrying off the whole frightened crowd, with the exception of one man who had shown himself a tolerable marksman and something removed from an abject coward, Kenyon showed them how to cross the chasm safely and quietly, and bade them get over at once with all the ammunition. Persuasion and explanation was, however, of no use at all, and he had to drive the first batch into the strange vehicle at the muzzle of his revolver. Then, finding they were quite safe, the negroes promptly commenced to chatter like so many monkeys, whereupon Kenyon threatened to shoot them, if he heard another sound, and then returned with all expedition to Leigh, who had posted himself so as to command the zig-zag, and had cleverly rolled a big rock into the very mouth of the channel by which the foe was approaching.

All was now in readiness, and a dead silence reigned. The hush of a tranquil tropical midnight was upon everything, and all nature was looking her loveliest under the glamour of the shimmering moonlight. All at once the stillness was marred by a footfall, and then rent, as it were, by a furious curse, as the leading slaver reached the top of the pass, and found the way blocked up. Climbing carefully over the stone, however, he safely reached terra firma, and was stooping down to remove the obstruction, when he was angrily hailed in nervous English by Kenyon—“Here, you dog, leave that stone alone, and go back by the way you came. Quickly now, and drop that rifle—drop it, I say, or your blood be on your own head!”

For answer, the fellow fired point-blank in the direction of the voice (for he could not see Kenyon, who was standing in the shadows of the wood), and then made for cover, but he never reached it; indeed, he had hardly moved in his tracks, when down he went, as dead as a door-nail, being followed a moment later, along the same dark and fearsome road, by a comrade who persisted in obtruding over the rock rather more of his person than Leigh was disposed to permit, and ere the thundering echoes of the rifles had ceased to answer and to mock one another amongst the surrounding rocks, the remainder of the slavers, having no more stomach for such work, were in full retreat down the rock, and half an hour later were seen steering wide out into the south-western veldt, thus putting entirely to rest any doubts which Kenyon still entertained of the feasibility of an attempt to scale the opposite cliffs.

Had there been any way of ascending on the other side of the kloof, it was quite certain the slavers would have known about it, whereas they had clearly found it necessary to make a very wide circuit in order to get round the rocks, and thus make their way back to head-quarters.

Sending forward their sable supporters with instructions to get the prisoners across the chasm, Kenyon led his wondering comrade up the cliffs to the right, where they suddenly came upon a small lake, obviously fed by a neighbouring mountain stream.

“Now, old fellow,” said he, “just lay down your rifle, and help me to break up this wall, and assist outraged nature to regain her ancient rights.”

Leigh quickly saw that the water, which came sweeping rhythmically down from the further heights beyond the hill, had at this point been artfully turned by a well-made wall, built of rock and broken stone, and apparently strengthened with mortar or cement, so that the stream, instead of exercising its own sweet will by zig-zagging down the rock, as it had done of yore, was wasted on the north-western veldt, where its advent had probably been largely responsible for the origination of the marsh, which had already given our friends such a world of trouble. The wall of the dam, however, proved considerably stronger than Kenyon had bargained for, so they finally bored a hole in it, and blew the whole affair up with a couple of flasks of powder taken from the fallen slavers.