It was noon when they emerged on a narrow, shelf-like plateau above the gorge. Here stood the last clump of stunted trees. Above them stretched the glistening snow-fields, pierced by crags of splintered granite. Rock, ice, and snow to the very summit. Here Binney said he could go no farther; and here, after building a fire and eating their lunch, the others left him to await their return.
A sheer wall of smooth, seamless rock, hundreds of feet in height, bounded one side of the shelf, and a precipice, almost as sheer, the other. For half a mile or so did Glen and his companion follow it, seeking some place at which they might continue their ascent. Finally it narrowed almost to a point, that terminated in an immense field of snow sloping down, smooth and spotless, for a thousand feet below them, to a tiny blue-black lake. Beyond the snow-field the ascent seemed possible; and, by cutting footholes in it with their hatchets, they managed to cross it in safety.
For two hours longer they struggled upward; and then, within a few hundred feet of the summit, they could get no farther. In vain did they try every point that offered the faintest hope of success, and at last were forced to give it up. They noted the reading of the barometer, and with a few shavings and slivers cut from its outside case they made a tiny blaze, and, as Glen expressed it, boiled a thermometer in a tin cup.
They were now as impatient to descend as they had been to climb upward, and even more so; for the brightness of the day had departed, and ominous clouds were gathering about them. The air was bitterly cold; and, with their few minutes' cessation from violent exercise, they were chilled to the bone. So they hastened to retrace their rugged way, sliding, leaping, hanging by their hands, and dropping from ledge to ledge, taking frightful risks in their eagerness to escape the threatened storm, or at any rate to meet it in some more sheltered spot. If they could only reach the shelf-like ledge, at the farther end of which Binney Gibbs awaited them, they would feel safe. They had nearly done so, but not quite, when the storm burst upon them in a fierce, blinding, whirling rush of snow, that took away their breath and stung like needles. It seemed to penetrate their clothing. It bewildered them. It was so dense that they could not see a yard ahead of them. They had already started to cross that long, sloping snow-field, beyond which lay the rocky shelf. To go back would be as dangerous as to proceed. They could not stay where they were. The deadly chill of the air would speedily render them incapable of maintaining their foothold.
The assistant engineer was leading the way, with his companion a full rod behind him. The former dared not turn his head; but he shouted encouragingly that they were almost across, and with a few more steps would reach a place of safety.
Then came a swirling, shrieking blast, before which he bowed his head. He thought he heard a cry; but could not tell. It might only have been the howl of the fierce wind. He reached the shelf of rock in safety, and turned to look for his companion; but Glen was not to be seen.
Blinded by that furious blast, the boy had missed his footing. The next instant he was sliding, helplessly, and with frightful velocity, down that smooth slope of unyielding snow, towards the blue lake hidden in the storm-cloud far beneath him.