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90 Four o'clock in the afternoon found them at the lake shore. It was a cloudy day with a fair breeze blowing across the lake.

"Now you sit right there," said Bert, as he pointed to a seat in the back of the boat. "And hold on tight or you'll be thrown overboard."

Nan took the seat mentioned, and her twin brother began to hoist the mainsail of the Ice Bird. It ran up easily, and caught by the wind the craft began to skim over the surface of the lake like a thing of life.

"Oh, but this is lovely!" cried Nan gleefully. "How fast the boat spins along!"

"I wish there were more ice boats around," answered Bert. "We might then have a race."

"Oh, it is pleasure enough just to sail around," said Nan.

Many other boys and girls wished a ride on the ice boat, and in the end Bert carried a dozen or more across the lake and back. It was rather hard work tacking against the wind, but the old sailor had taught him how it might be done, and he got along fairly well. When the ice boat got stuck all the boys and girls got off and helped push the craft along.