At length, about a couple of hours before dawn, we arrived at the edge of a ravine, the sides of which, though not precipitous, appeared to be _very_ steep, and down which it would have been madness to attempt taking the waggon in the dark.  We must either stop, or try to find a passage across to the north or south.  We had observed that the valleys already passed by us were shallower to the southward; we therefore turned our waggon in that direction, hoping shortly to discover a practicable path, though we suspected that it would lead us even further from the track of our friends.