strong he belonged to his vengeance on Jim Silent; and when she heard Dan whistling softly his own wild, weird music, she knew its meaning as she would have known the wail of a hungry wolf on a winter night. It was the song of the untamed. She never spoke of her knowledge. She took the happiness of the moment to her heart and closed her eyes against tomorrow.
Then came an evening when she watched Dan play with Black Bart—a game of tag in which they darted about the room with a violence which threatened to wreck the furniture, but running with such soft footfalls that there was no sound except the rattle of Bart's claws against the floor and the rush of their breath. They came to an abrupt stop and Dan dropped into a chair while Black Bart sank upon his haunches and snapped at the hand which Dan flicked across his face with lightning movements. The master fell motionless and silent. His eyes forgot the wolf. Rising, they rested on Kate's face. They rose again and looked past her.
She understood and waited.
"Kate," he said at last, "I've got to start on the trail."
Her smile went out. She looked where she knew his eyes were staring, through the window
