"You must have eyes like a hawk," declared Stacy, with emphasis.

"Eyes were made to see with," answered Nance shortly.

"And ears to hear, and feet to foot with, and-----"

"Young men, it is time you were in bed. I presume Mr. Nance will be
wanting to make an early start in the morning," said the Professor.

"If we are to get back the same day we'll have to start about daybreak.
It's a hard trail to pack. You'll be ready to stretch your legs when
we get back to-morrow night."

The boys were not ready to use those same legs when they were turned
out at daybreak. There was some grumbling, but not much as they got up
and made ready their hurried breakfast. In the meantime Nance had
gotten together such provisions as he thought they would need. These
he had packed in the saddle bags so as to distribute the weight. Shortly
after breakfast they made a start, Dad going first, Tad following close
behind.

The first two miles of the Bright Angel Trail was a sort of Jacob's
ladder, zigzagging at an unrelenting pitch. Most of the way the boys
had to dig their knees into the sides of their mounts to prevent
slipping over the animals' necks.

"This is mountain climbing backwards," jeered Stacy.

"I don't know, but I guess I like it the other way," decided Walter,