some slight risk from adverse changes in the weather, and extreme discomfort from cold, and possibly hunger, but these latter are mere trifles to strong men, properly clad; and as for the former, such places as the great couloir of the western Matterhorn are far safer in a snowstorm than when the setting sun is blazing on the great slopes above. Indeed, when snow falls at a low temperature it instantly dries up the trickles of water, stops the melting of the great pendent icicles, and generally checks the fall of missiles, thus rendering slopes and couloirs, which one dare not climb in fine weather, fairly safe. On the other hand, a summer snow squall followed by a wind above freezing point (a not infrequent phenomenon), will convert rock slopes, usually innocent, into cascades of water, armed and rendered terrible by stones and dislodged crags. It will thus be seen that most accurate judgment is necessary, and the requisite knowledge for this judgment is hardly to be obtained till the climber has learnt, by dangerous experience, to grasp the exact nature of the storm, and the effect it is likely to have on the slope he is dealing with.
Climbers sometimes write as though it were possible to avoid all slopes down which stones or ice can ever fall. In actual fact, though such slopes may, to some extent, be avoided on the days and at the hours when such falls may be most expected, it is impossible to keep wholly clear of them.
