"Farther along," Jim hardly whispered, tugging at the Sheriff's coat. "Let Larry come along!"

The giant form of the Sheriff unbent a little when he turned, stretched out a hand and gripped that youth by the shoulder.

"I heard," came a whisper. "I've got me gun, and all's well. You get in, Jim, I'm following."

The party they left heard them stumbling along, their feet making mysterious sounds as they splashed along the floor of the tunnel, and then of a sudden the blackness in front of them was illuminated by one piercing beam which cut its way through the darkness, its edges brilliant, its centre blurred. That beam hit upon the dripping side of the tunnel some yards ahead, painted a brilliant circle on it, hovered to one side, then flicked back, and later showed in its very centre the figure of a man bent almost double crouching beside the wall, a metal object on one knee gripped by one hand, an object which reflected the beam brightly.

"It's——" shouted the Sheriff, and then a sharp crack from a revolver drowned his voice and stunned the ears of all present. They saw the flash of the weapon, and a moment later watched as the crouching figure darted along the side of the tunnel, and swept round a corner, while a second shot, a second reverberation, wakened the echoes, and a bullet flicked a piece out of the edge of rock round which that crouching figure had doubled.

"Come on," shouted Jim, while Larry beat himself on the breast, vexed that he should have missed such a shot.

"It's the light," he cried angrily, "it put me out; I wasn't expecting it. Seems to me I'd better have a torch, too. Here! hand one over, Jim, then I shall know when to put it on and be ready."

For five minutes or more they struggled on, running at times, and then halting to listen. Finally Larry clapped a wet and perspiring hand on Jim's shoulder.

"Gee!" he said; "it ain't no good, this here runnin' up and down like rabbits. Every time we moves the fellow hears us. This party's too big. Let's divide, or, better still, supposin' we post sentries who will block the tunnel. You see the skunk we're after is mebbe bolting round and round in a circle."