His acute senses, the old inherited primitive instinct, noticed at once the jarring note.

He moved ever so little but an extraordinary change came over his face.

The idle look of luxury and basking warmth passed away and the eyes became alert, watchful, defiant.

Every feature, every muscle was drawn, as if he were at the utmost tension.

Almost unconsciously his figure sank down farther against the log, until it blended perfectly with the bark and the fallen leaves below.