He felt one of the men pinion his waving arms, while the other crouched on his legs and proceeded to unpin the money pocket. Ferris struggled for an instant in futile fury, trying to shout for help. The call was strangled in his throat. But the help came to him, none the less.

Scarce three seconds had passed since the attempt to rob him had set Link into action and had wrung from him that yell of consternation.

But in answer came a swirling patter of feet on the road, a snarl like a wolf's, a shape that catapulted through the dark. Sixty pounds of fur-swathed dynamic muscle smote athwart the shoulders of the man who was unfastening the cash pocket's pin.

The impact hurled the fellow clean off his crouching balance and sent him sprawling, face downward, his outflung hands splashing in the margin of the lake. Before he could roll over or so much as stir, a set of white fangs met in his shoulder-flesh. And he testified to his injury by an eldritch screech of pain and terror that echoed far across the water.

His companion, rallying from the momentary shock, left Ferris and charged at the prostrate thief's assailant. But Chum met him, with a fierce eagerness, more than half way.

A true collie--thanks to his strain of wolf bloodfights as does no other dog. What he lacks in stubborn determination he atones for by swiftness and by his uncanny brain power.

A bulldog, for example, would have flown to his master's relief quite as readily as did Chum. But a bulldog would have secured the first convenient hold and would have hung on to that hold, whether it were at his victim's throat or only on the slack of his trousers--until someone should hammer him into senselessness.

Chum--collie-fashion--was everywhere at once, using his brain far more than his flying jaws. Finding the grip in his foe's shoulder did not prevent the man from twisting round to grapple him, the collie shifted that grip with lightning speed, and with one of his gleaming eyeteeth slashed his opponent's halfturned cheek from eye to chin. Then he bored straight for the jugular.