"Look closely. Any fifteen-year-old boy of the plains could explain it."
"Am I so ignorant?" she laughed.
"No," he answered soberly, "our eyes just refuse to see things at which we are looking until the voice within reveals. The eyes of a hunter could make no mistake about such a spot—particularly if it moved."
"It might be a passing cloud—"
"There's none in the sky."
"Tell me!" she pleaded.
"A herd of buffalo."
"That big black field! It must be ten acres—"
The man laughed at her ignorance with a sudden longing in his heart to help and protect her.
"Ten acres! Look again. They are twenty miles away. The herd is packed so densely, the ground is invisible. They cover a thousand acres."