William Torrey,
Torrey's Narrative…
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“ To travel in Peru, is a severe hardship and privation; the mule is much used. This animal is invaluable from its cautious instinct in passing the defiles or sides of the mountains, where a misstep would cast them to a measureless distance below. In many places where they cannot step, they protrude their feet, and slide downwards, directing their course with the utmost sagacity. It is not safe for the rider to assume any guidance over them, when he is riding with one leg over a precipice, while the other rubs against the side of the mountain. ”
Source: Gutenberg