The arrangement worked well.

The signals were given and answered, but they did not get out of the fog.

On the contrary, it seemed to grow thicker as they advanced.

“Come,” said Harry, at last; “this won’t do. We really must get back.”

“Just a little farther, dear boy,” replied Jack. “I am sure it is growing lighter.”

The words were scarcely spoken when a dark, black mass loomed up before them, and the keel of the boat grated on the sand.

“Well, by Jove!” cried Harry, “you were right! Here we are on the Arabian shore, hard and fast.”

“That’s what it is,” said Jack. “Shall we go back, or shall we make a landing and find out what we’ve struck?”

“Let’s go ashore first, if it is only for a minute or two. That seems to be a hill; perhaps if we could get to the top we might see something to the eastward; it certainly does look lighter over there now.”

They pulled the boat high up on the sand, and walked toward the dark mass which loomed up dimly through the mists.