“To work! to work!” shouted Ford, when the party reached the further end of the passage; and he grasped a heavy crowbar and brandished it.

“Stop one instant,” said Starr. “Let us see if any change has taken place, and if the fire-damp still escapes through the crevices.”

“You are right, Mr. Starr,” said Harry. “Whoever stopped it up yesterday may have done it again to-day!”

Madge, seated on a rock, carefully observed the excavation, and the wall which was to be blasted.

It was found that everything was just as they left it. The crevices had undergone no alteration; the carburetted hydrogen still filtered through, though in a small stream, which was no doubt because it had had a free passage since the day before. As the quantity was so small, it could not have formed an explosive mixture with the air inside. James Starr and his companions could therefore proceed in security. Besides, the air grew purer by rising to the heights of the Dochart pit; and the fire-damp, spreading through the atmosphere, would not be strong enough to make any explosion.

“To work, then!” repeated Ford; and soon the rock flew in splinters under his skillful blows. The break was chiefly composed of pudding-stone, interspersed with sandstone and schist, such as is most often met with between the coal veins. James Starr picked up some of the pieces, and examined them carefully, hoping to discover some trace of coal.

Starr having chosen the place where the holes were to be drilled, they were rapidly bored by Harry. Some cartridges of dynamite were put into them. As soon as the long, tarred safety match was laid, it was lighted on a level with the ground. James Starr and his companions then went off to some distance.

“Oh! Mr. Starr,” said Simon Ford, a prey to agitation, which he did not attempt to conceal, “never, no, never has my old heart beaten so quick before! I am longing to get at the vein!”

“Patience, Simon!” responded the engineer. “You don’t mean to say that you think you are going to find a passage all ready open behind that dyke?”

“Excuse me, sir,” answered the old overman; “but of course I think so! If there was good luck in the way Harry and I discovered this place, why shouldn’t the good luck go on?”