CHAPTER XVII
INVISIBLE DANGERAlcatraz, cresting the hill, warned the mares with a snort. One by one the bays brought up their beautiful heads to attention but the grey, as was her custom in moments of crisis or indecision, trotted forward to the side of the leader and glanced over the rolling lands below. Her decision was instant and decisive. She shook her head and turning to the side, she started down the left slope at a trot. Alcatraz called her back with another snort. He knew, as well as she did, the meaning of that faint odor on the east wind: it was man, unmistakably the great enemy; but during five days that scent had hung steadily here and yet, over all the miles which he could survey there was no sign of a man nor any places where man could be concealed. There was not a tree; th
