to beat them. Tommy Todd may come in ahead of them, though."
"We can skate up to him and tell him not to," suggested Nan.
"Good idea!" declared Bert. "We'll do it."
The older twins skated a little faster to overtake Tommy, who was some distance behind Flossie and Freddie, when suddenly Nan gave a cry and clutched Bert by the arm.
"Look!" she exclaimed, pointing with her hand.
"An ice-boat," remarked Bert. "And going fast, too!"
"Yes, but see! It's coming right toward Flossie and Freddie, and they're skating with their heads down, and don't see it! Oh, Bert! Yell at them! Tell them to look out! Yell at the man in the ice-boat!"
It did indeed seem a time of danger, for a swift ice-boat—one with big white sails and runners, like large skates under it, was skimming over the frozen lake straight for the smaller twins.
