"Your father was in there once," remarked Cap'n Bill, "an' he says
it's the biggest cave on the coast, but low down. It's full o'
water, an' the water's deep down to the very bottom o' the ocean;
but the rock roof's liable to bump your head at high tide ."

"It's low tide now," returned Trot. "And how could any giant live in
there if the roof is so low down?"

"Why, he couldn't, mate. I reckon they must have called it Giant's
Cave 'cause it's so big, an' not 'cause any giant man lived there."

"Let's go in," said the girl again. "I'd like to 'splore it."

"All right," replied the sailor. "It'll be cooler in there than out
here in the sun. We won't go very far, for when the tide turns we
mightn't get out again." He picked up the oars and rowed slowly
toward the cave. The black archway that marked its entrance seemed
hardly big enough to admit the boat at first, but as they drew
nearer, the opening became bigger. The sea was very calm here, for
the headland shielded it from the breeze.

"Look out fer your head, Trot!" cautioned Cap'n Bill as the boat
glided slowly into the rocky arch. But it was the sailor who had to
duck, instead of the little girl. Only for a moment, though. Just
beyond the opening the cave was higher, and as the boat floated into
the dim interior they found themselves on quite an extensive branch
of the sea. For a time neither of them spoke and only the soft
lapping of the water against the sides of the boat was heard. A
beautiful sight met the eyes of the two adventurers and held them