. Then they
prepared to spend the night in their hastily made camp. They
collected driftwood, with which to make a fire, and, after supper,
which was prepared on the gasolene stove, they sat about the
cheerful blaze, discussing their adventures.

"To-morrow we will explore the island," said Tom, as he rolled
himself up in his blankets and turned over to sleep. The others
followed his example, for it was decided that no watch need be kept.
Thus passed several hours in comparative quiet.

It must have been about midnight that Tom was suddenly awakened by a
feeling as if someone was shaking him. He sat up quickly and called
out:

"What's the matter?"

"Eh? What's that? Bless my soul! What's going on?" shouted Mr.
Damon.

"Did you shake me?" inquired Tom.

"I? No. What--?"

Then they realized that another earth-tremor was making the whole
island tremble.

Tom leaped from his blankets, followed by Mr. Damon and Mr. Fenwick,
and rushed outside the shack. They felt the earth shaking, but it
was over in a few seconds. The shock was a slight one, nothing like
as severe as the one in the morning. But it set their nerves on
edge.

"Another earthquake!" groaned Mr. Damon. "How often are we to have
them?"

"I don't know," answered Tom, soberly.

They passed the remainder of the night sleeping in blankets on the
warm sands, near the fire, for they feared lest a shock might bring
the shack down about their heads. However, the night passed with no
more terrors.

CHAPTER XV

THE OTHER CASTAWAYS

"Well, we're all alive, at any rate," announced Tom, when the bright
sun, shining into his eyes, had awakened him. He sat up, tossed
aside his blankets, and stood up. The day was a fine one, and the
violence of the sea had greatly subsided during the night, their
shack had suffered not at all from the slight shock in the darkness.

"Now for a dip in old Briney," the lad added, as he walked down to
the surf, "I think it will make me feel better."

"I'm with you," added Mr. Fenwick, and Mr. Damon also joined the
bathers. They came up from the waves, tingling with health, and
their bruises and bumps, including Tom's cut leg, felt much better.

"You did get quite a gash; didn't you," observed Mr. Fenwick, as he
noticed Tom's leg. "Better put something on it. I have antiseptic
dressings and bandages in the airship, if we can find them."

"I'll look for them, after breakfast," Tom promised, and following a
fairly su