"Stop! stop!" yelled Bob.
With a snarl the madman bent to his work. Soon the boat was in deep water.
In desperation Bob leaped into the water after it.
Ere he could reach the craft the madman picked up the long ice pole and aimed a vicious prod with it at our hero's breast.
Bob was struck squarely, and on the instant disappeared beneath the surface with the shrill laugh of the crazy sailor ringing in his ears.
Chapter VII.—A Fearful Fall.
"Where am I? Where are mother and Miss Viola?"
It was Bob who spoke. Jack Larmore stood over him in the snow.
"You're all right—I got you out of the water," Jack made answer.
"And the others?"