Canoeing in the Wilderness by Henry David Thoreau

We had smooth but swift water for a considerable distance, where we glided rapidly along, scaring up ducks and kingfishers. But, as usual, our smooth progress ere long come to an end, and we were obliged to carry canoe and all about half a mile down the right bank around some rapids or falls. It required sharp eyes sometimes to tell which side was the carry, before you went over the falls, but Polis never failed to land us rightly. The raspberries were particularly abundant and large here, and all hands went to eating them, the Indian remarking on their size.

Often on bare rocky carries the trail was so indistinct that I repeatedly lost it, but when I walked behind him I observed that he could keep it almost like a hound, and rarely hesitated, or, if he paused a moment on a bare rock, his eye immediately detected some sign which would have escaped me. Frequently _we_ found no path at all at these places, and were to him unaccountably delayed. He would only say it was "ver' strange."