It was the way he had learned.
"Gee!" Thornton's voice rang out, sharp in the tense silence.
Buck swung to the right, ending the movement in a plunge that took up the slack and with a sudden jerk arrested his one hundred and fifty pounds.

The load quivered, and from under the runners arose a crisp crackling.
"Haw!" Thornton commanded.
Buck duplicated the manoeuvre, this time to the left.

The crackling turned into a snapping, the sled pivoting and the runners slipping and grating several inches to the side.

The sled was broken out.

Men were holding their breaths, intensely unconscious of the fact.
"Now, MUSH!" Thornton's command cracked out like a pistol-shot.