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ON A SAND BAR
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"I hope the gasoline isn't giving out," she murmured.

"The idea!" cried Grace.

Then with a shock that threw all the girls forward in their seats the Gem came to a sudden halt, and the engine raced furiously. Betty at once shut off the power.

"Oh, oh!" cried Grace. "What is it? Has an alligator got hold of us?"

Betty looked over the bow. Then she said grimly:

"We've run on a sand bar—that's all. Run on it good and hard, too, I wonder if we can get off?"