this

place, his powers of climbing; for, with his usual accuracy, he has taken the angle of the path for us, saying it was considerable more than forty-five. Now a continuous mountain slope of forty-five degrees is already quite unsafe either for ascent or descent, except by zigzag paths; and a greater slope than this could not be climbed, straightforward, but by help of crevices or jags in the rock, and great physical exertion besides.”