"There's not enough to float us."
"What are we going to do?" demanded Poole, looking at his crony with much concern showing in his face.
"Perhaps we can back her," suggested Merwell. "I'll reverse the engine and try."
This was done, but though the propeller churned the water into a foam and sent some sand flying into the air, the motor boat remained firmly on the bar.
"It's no use," sighed Nat. "Stop the engine, or you may break something." And then the power was turned off.
"What are we to do?" questioned Sadie Fillmore. "We can't stay here forever."
"Here comes that rowboat!" cried Vera, a moment later.
"Oh, let us signal to them!" exclaimed Mary, and standing up she waved her handkerchief, and then her big sailor hat.
"We don't want those fellows here!" growled Link Merwell. "They can go about their business. We'll get the boat off the sandbar somehow."
"We do want them," answered Vera, and joined her friend in signaling, and Sadie Fillmore did the same.
It was not long before the other boat came within hailing distance. Seeing that the motor
