"No, not yet!" exclaimed Bert. "Don't touch anything, Freddie!" he went on, for his little brother was reaching out toward the sail. "I'll have to wait until the wind doesn't blow so strong before I can let your steer, Freddie."
"But I want to steer when we're going fast!" cried the little fellow. "I know how to do it. You just———"
Freddie never finished what he was saying. Whether he touched anything, or whether Bert was afraid he would, and so pulled on the wrong rope to keep it out of Freddie's way, was never known.
Suddenly the ice-boat gave a quick whirl to one side, like a boy or a girl on roller skates going around a corner. It went around so quickly that it tipped half-way over. Mrs. Bobbsey and Nan screamed. Mr. Bobbsey called to Bert to be careful, but it was too late. Bert had lost his hold of the rudder and the sail rope.
The next second Bert shot out of the ice-boat, and slid along on his back. A moment later his father and mother were also spilled out, followed by Nan. Then the ice-boat, not
