“Go ahead, then, I’ll follow,” said Tom, whose courage had returned with the light, “I’m game for anything that I can see; but I confess to you that I can not stand howls, and groans and darkness.”

Notwithstanding their utmost efforts they failed to discover the cause of the mysterious sounds, which seemed at times to be voices muttering, while at other times they swelled out into a loud cry. All that could be certainly ascertained was, that they proceeded from the roof of the innermost cavern, and that the centre of that roof was too high to be discerned by torch-light.

“What shall we do now?” inquired Tom.

“We shall go to the summit of the hill above this cave, and see what is to be seen there. Always look at both sides of a mystery if you would fathom it; come along.”

In a few minutes they stood in open air, and once more breathed freely. Mounting their horses, they ascended the steep slope of the hill above the cave, and, after some trouble, reached the summit. Here the first thing that met their gaze was a camp-fire, and near to it several men engaged in harnessing their horses to a large waggon or van. The frantic haste with which they performed the operation convinced Ned that he had discovered the cause of the mysterious voices, and that he and Tom had been the innocent cause of frightening the strangers nearly out of their wits. So engrossed were they with their work, that our travellers advanced within the circle of light of their fire before they were discovered. The man who first saw them uttered a yell, and the whole party turned round, seized their rifles, and, with terror depicted on their countenances, faced the intruders.

“Who comes here?” shouted one.

“Friends,” answered Ned, laying down his rifle and advancing.

Instantly the men threw down their arms and resumed the work of harnessing their horses.

“If ye be friends,” cried the one who spoke first, “give us a hand. I guess all the fiends in the bottomless pit are lo-cated jist below our feet.”

“Listen to me for one moment, gentlemen,” cried Ned Sinton. “I think I can relieve your minds. What have you heard or seen?”