Here, since reference has just been made to the effect of the sun's glare on the face of one member of the party, it may be in place to speak of the perfect eye protection which the amber snow-glasses afforded us. Long experience with blue and smoke-colored glasses upon the trail in spring had led us to expect much irritation of the eyes despite the use of snow-glasses, and we had plentifully provided ourselves with boracic acid and zinc sulphate for eye-washes. But the amber glasses, with their yellow celluloid side-pieces, were not a mere palliative, as all other glasses had been in our experience, but a complete preventive of snow-blindness. No one of us had the slightest trouble with the eyes, and the eye-washes were never used. It is hard for any save men compelled every spring to travel over the dazzling snows to realize what a great boon this newly discovered amber glass is. There is no reason anywhere for any more snow-blindness, and there is no use anywhere for any more blue or smoked glasses. The invention of the amber snow-glass is an even greater blessing to the traveller in the north than the invention of the thermos bottle. No test could be more severe than that which we put these glasses to.
We were now at the farthest point at which it was possible to use the dogs, at our actual climbing base, and the time had come for Johnny and the dogs to go down to the base camp for good. We should have liked to keep the boy, so good-natured and amiable he was and so keen for further climbing; but the dogs must be tended, and the main food for them was yet to seek on the foot-hills with the rifle. So on 9th May down they went, Tatum and the writer escorting them with the rope past the crevasses as far as the first glacier camp, and then toiling slowly up the glacier again, thankful that it was for the last time. That was one of the sultriest and most sweltering days either of us ever remembered, a moist heat of sun beating down through vapor, with never a breath of breeze--a stifling, stewing day that, with the steep climb added, completely exhausted and prostrated us.
It is important that the reader should be able to see, in his mind's eye, the situation of our camp at the head of the glacier, because to do so is to grasp the simple orography of this face of the mountain, and to understand the route of its ascent, probably the only route by which it can be ascended. Standing beside the tent, facing in the direction we have journeyed, the great highway of the glacier comes to an abrupt end, a cul-de-sac. On the right hand the wall of the glacier towers up, with enormous precipitous cliffs incrusted with hanging ice, to the North Peak of the mountain, eight or nine thousand feet above us. About at right angles to the end of the glacier, and four thousand feet above it, is another glacier, which discharges by an almost perpendicular ice-fall upon the floor of the glacier below.[2] The left-hand wall of the glacier, described some pages back as a stupendous escarpment of ice-covered rock, breaks rapidly down into a comparatively low ridge, which sweeps to the right, encloses the head of the glacier, and then rises rapidly to the glacier above, and still rises to form the left-hand wall of that glacier, and finally the southern or higher peak of the mountain.