"Very sorry, old boy," said Bob; "but we are going to clear away the fire and build it in another place. Better wake up and help in this job, or we may have a pretty rough night of it."

With a very great effort, Dave Brandon arose.

"What do you want me to do?" he asked, with a prodigious yawn.

"Get the fire shoved over to this place I have marked," said Bob, indicating a spot about ten feet distant. "Just as soon as the ground is thawed, we'll have to dig four holes for the corner posts."

"Just think, we've got two of these old dens to build," grumbled John Hackett.

"Oh, never mind," said Nat. "I'm going to help, and we'll consider that it's a fine evening of sport."

Encouraged by these words, the tired boys set to work.

"In the first place, we'll need a lot of slender maples for the sides and roof," said Bob; "and any quantity of fir brush."

"I'm going to select trees for the posts," declared Sam Randall. "These huts are going to be built in a hurry, I can tell you that."

In a few moments, the sound of the young woodsmen's sturdy blows were being carried over the frosty air. As fast as the trees were felled, Tom Clifton trimmed off the branches. Then Dick Travers and Sam Randall began to gather the fir brush until an enormous pile was ready for use.