He gripped Jerry by the arm.

"The wrong tack!" he bellowed in the mate's ear. "Run it over to leeward, and put it over when I wave my arm. Watch sharp!"

"Aye!" shouted Tab, but Jack was already gone.

Castleport stumbled aft much as he had gone forward, now climbing laboriously up hill, now leaning back and struggling to keep himself from rushing headlong down the sloping deck with an impetus that would have carried him overboard. When he reached the cockpit, he dropped inside almost spent.

"Back the helm every time she rises!" he called to the men at the wheel. "We want her to fall over!"

"Aye, aye, sir."

"Now, then,—over with her!" he cried, as the yacht rose.

The men gave her all they dared. The effect was imperceptible.

"Hold her!" shouted Jack.