ot to keep in motion or we'll freeze."

"Then let's tackle that block of ice at the entrance," suggested Russ.
"Get out your knife and we'll see if we can't cut a hole large enough to
crawl through."

If you have tried to cut with a pocket knife even the small piece of ice
which you get in your refrigerator, you can appreciate the task that
confronted the two young men. A solid block of ice had slid down from
some higher point, and had blocked the opening to the odd cavern. But
the two were not daunted. They realized the necessity of getting out,
and that within a short time. Though they were all warmly dressed, the
air of the cavern was chilly, to say the least.

"Keep moving, girls!" called Russ to Ruth and Alice, as he and Paul
chipped away at the ice. "This exercise will keep us warm; but you need
to do something to keep your blood in circulation. Here, take my coat!"
he called, as he arose from his knees, and tossed the garment to Ruth.

"I shall do nothing of the sort!" she answered, promptly. "You need it
yourself."

"No, I don't," he replied, earnestly. "It only bothers me when I try to
cut the ice. Please take it."

"But I can't get it on over my cloak."

"Yes, you can. Put it around your shoulders. I'll show you how." And he
did it quickly, wrapping it warmly around her.

"Here, Alice, you take mine!" cried Paul, as he saw what his companion
had done. "You need it more than I do, and I can't get at that ice with
a big coat like this on."

In spite of her protests he put it about her, and the added warmth of
the garments was comforting to the girls.

The boys, really, were better off without them, for they had much
vigorous work before them, and in the narrow quarters the heavy coats
only hampered them.

For it was an exceedingly narrow space in which they had to work. The
fall of the mass of ice had crushed part of the opening into the cave,
so that Russ and Paul had to crouch down and stoop in a most
uncomfortable position in order to reach the block that had closed the
doorway.

With their knives they hacked away at the frozen mass, sending the
chips flying. Much of it went in their faces and soon their cheeks were
glowing from the icy spray of splinters. Then, too, they had to stop
every now and then to clear away the accumulated ice crystals that fell
before the attack of their knives.

"Keep moving, girls," Paul urged Ruth and Alice. "Keep circling around
or you'll surely freeze."

"Let