Coming out upon canuon rim, she heard Dale's clear call, far down, and Bo's answering peal, high and piercing, with its note of exultant wildness.

Helen also heard the bear and the hound fighting at the bottom of this canuon.
Here Helen again missed the tracks made by Dale and Bo.

The descent looked impassable.

She rode back along the rim, then forward.

Finally she found where the ground had been plowed deep by hoofs, down over little banks.