Having noted the compass bearings of their general course, they plunged directly into the dense fir forest with which this flank of the mountain was covered to a height of a thousand feet or so above them. For several hours they struggled through it, sometimes clambering over long lanes of fallen trees, prostrated by fierce wind-storms, and piled in chaotic heaps so thickly that often, for half a mile at a time, their feet did not touch the ground. Then they came to a region of enormous granite blocks, ten to thirty feet high, over many of which they were obliged to make their way as best they could. Now they began to find patches of snow, and the timber only appeared in scattered clumps.