"Oh, it's deep enough through here," the boy responded carelessly. "I make the pa.s.sage every day."

"What island are we pa.s.sing?"

"Hat. The water always is shoal here. Just sit tight and quit scowling at me."

"I didn't know I was," Penny said, sinking back into the cushions.

The _Spindrift_ gently grazed bottom. Dismayed, Penny straightened up, peering over the side. The boat was running hard into a mud bank.

"About! Bring her about, Jack!" she cried before she considered how he might take the uninvited advice.

"The water is deep enough here," Jack answered stubbornly. "It's only a tiny shoal. We'll sail through it easily."

Penny said nothing more, though her lips drew into a tight line.

Jack held to his course. For a moment it appeared that the boat would glide over the shoal into deeper water. Then the next instant they were hard aground. The sail began to flap.

"We're stuck like a turtle in a puddle," commented Penny, not without satisfaction.

"We'll get off!" Jack cried, seizing a paddle from the bottom of the boat.

He tried to shove away from the shoal, but the wind against the big sail resisted his strength.

"You'll never get off that way," Penny said calmly. "Why not take down the sail? We're hard aground now."

Jack glared, and looked as if he would like to heave the paddle at her.

"Okay," he growled.

Winds which came from the head of Hat Island were tricky. Before Jack could lower the sail, the breeze, shifting slightly, struck the expanse of canvas from directly aft.

"Look out, Jack!" Penny screamed a warning. "We're going to jibe!"

Jack ducked but not quickly enough. With great violence, the wind swung the sail over to the opposite side of the boat, the boom striking him a stunning blow on the back of the head.

Moaning with pain, he slumped into the bottom of the _Spindrift_.

CHAPTER 6 SWEEPER JOE INFORMS

Alarmed for Jack, Penny scrambled over a seat to his side. He had been struck a hard blow by the swinging boom and there was a tiny jagged cut just behind his ear. A glance satisfied the girl that he was not seriously injured and that she could do nothing for him at the moment.

Turning her attention to the sail which was showing an inclination to slam over again, she quickly pulled it in and lowered it to the deck.

By then Jack had opened his eyes. His bewildered gaze rested upon her, and he rubbed his head.

"You--" he mumbled, raising on an elbow.

Penny firmly pushed him back. "Lie still!" she commanded.

Seizing the paddle, she tried to shove the boat backwards off the mud bank. Her best efforts would not move it an inch.

Slowly Jack raised himself to a sitting position. He rubbed his head.

Bewilderment changed to a look of comprehension.

"I'm okay now," he said huskily. "We're hard aground, aren't we?"

"Solid as a rock," agreed Penny, wiping perspiration from her forehead.

"Any ideas?"

"I'll get out and push."

"You're not strong enough. You took a nasty blow on the head."

Had not Jack looked so thoroughly miserable, Penny might have been tempted to adopt an "I told you so" att.i.tude. There had been no excuse for running aground. Sally Barker had warned them about the shoal, and Jack deliberately had disregarded her advice.

"I guess it was my fault," Jack mumbled, the words coming with difficulty. "The water was deep enough here yesterday. I was so sure--"

His eyes, like those of an abused puppy, appealed to her for sympathy.

Suddenly, Penny's resentment vanished and she felt sorry for Jack.

"Never mind," she said kindly. "We'll get off somehow. If necessary, I can swim to Shadow Island for help."

"It won't be necessary." Jack pulled off shoes and socks, and rolled up his slacks above his knees. "I got us into this, and I'll get us out.

Just sit tight."

Despite Penny's protests, he swung over the side, into the shallow water.

Applying his shoulder to the _Spindrift's_ bow, he pushed with all his strength. Penny dug into the mud with the paddle.

The boat groaned and clung fast to the shoal. Then inch by inch it began to move backwards.

"We're off!" Penny cried jubilantly.

Jack pushed until the _Spindrift_ was safely away from the shoal. Wet and plastered with mud, he scrambled aboard.

"No use putting up the sail," he said gloomily. "The centerboard is damaged. When we went aground I should have pulled it up, but things happened so fast I didn't think of it."

"Can't it be repaired?"

"Oh, sure, but it means hauling the boat out of water for several days.

And the race will be held in a week. I'll have no chance to practice."

"It's a bad break," Penny said sympathetically. "Perhaps the centerboard isn't much damaged."

They paddled to the Shadow Island dock. There with the help of the Gandiss chauffeur, Jack tied ropes under the bottom of the _Spindrift_ and by means of a hoist and crane, lifted the boat a few feet out of water. A piece had been broken from the centerboard and the bottom was so badly scratched that it would have to be repainted before the race.