sullen nervousness and were kicking savagely at everything that came
near. Decidedly something was wrong. The wise-headed grey mare loped out
to meet him and threw a course of circles around him as he came slowly
forward. Plainly she expected him to do something, but what this might
be Alcatraz could not tell. Besides, a growing thirst was making him
irritable and the insistence of the grey mare made him wish to fasten
his teeth over the back of her neck and shake her into better behavior.

By her antics she had worked him around to the head of the herd and she
had no sooner reached this point than she threw up her head with a
shrill neigh and started off at a gallop. The entire herd rushed after
her and Alcatraz, in a bound, ranged along side the grey and a neck in
the lead. While he ran he whinnied a soft question to which she replied
with a toss of her head as though impatient at such ignorance. In
reality she was guiding the herd. She knew it and Alcatraz understood
her knowledge, but he made a show of maintaining the guidance, keeping a
sharp outlook and turning the moment she showed signs of veering in a
new direction. Sometimes, of course, he misread her intentions and
swerved across her head and on each of these occasions she reached out
and nipped him shrewdly. Alcatraz was too taken up in his wonder at the
actions of the herd to resent this insolence. For half an hour they kept
up the steady pace and then Alcatraz literally ran into the reason.

It was a beautiful little lake, bedded in hard gravel and maintained by
a dribble of water from a brook on the north shore. Alcatraz snorted in
disgust at his folly. What had disturbed them was exactly what had
disturbed him--thirst. He controlled his own desire for water, however,
and followed an instinct that made him draw back and wait until all the
rest--the oldest stallion and the youngest colt--had waded in and
plunged their noses deep in the water. Then he went to the lake edge a