“It must be made bigger,” Bevis thought. “The mainsail must be made ever so much larger, and it must reach to where I sit. That’s the mistake—you can see it in a minute. Mark! Mark!” He shouted and whistled.

Mark came presently running. “I’ve been all round,” he said panting, “and I’ve—”

“This is it,” said Bevis, holding up his pocket-book.

“I’ve seen a huge jack—a regular shark. I believe it was a shark—and three young wild ducks, and some more of those parrots up in the trees.”

“The mainsail—”

“And something under the water that made a wave, and went along—”

“Look, you see it ought to come—”

“What could it have been that made the wave and went along?”

“O! nothing—only a porpoise, or a seal, or a walrus—nothing! Look here—”

“But,” said Mark, “the wave moved along, and I could not tell what made it.”