"You must be careful," Andy warned them.

"What's the use?" asked Mark despondently. "I don't believe we'll ever
find the projectile."

"Of course we will!" exclaimed Jack. "I know we can't be far from it,
only we can't see it because of the mountains. If we only had some way
of letting them know where we are, they could signal to us."

"By gum!" suddenly exclaimed Andy.

"What's the matter?" asked Jack, for the old hunter was capering about
like a boy.

"Matter? Why, the matter is that I'm a double-barrelled dunce," was the
answer. "Look here; do you see that?" and he held up his rifle.

"Sure," replied Jack, wondering if their sufferings and worry had made
the old hunter simple-minded.

"What is it?" asked Andy, shaking it in the air.

"Your rifle," answered Mark, looking at Jack in surprise.

"Of course," answered the hunter, "and a rifle is made to be fired off,
and here I've been carrying mine for nearly three days now, and I
haven't shot it once. You wanted a signal to make the folks in the
projectile hear us. Well, here it is I I guess they can hear this, and
when they do they can come and get us, for we don't seem able to reach