On all sides it cracked alarmingly, while they felt it sag beneath their feet. It is bad in the dark to ride the ice of an overflow, for one may crash through ankle-deep to the solid body beneath or plunge to his armpits.
They skated over the yielding surface toward safety till, without warning, Crowley smashed in half-way to his hips. He fell forward bodily, and the ice let him through till he rolled in the water. Buck skimmed over more lightly, and, when they had reached the solid footing, helped him wring out his garments. Straightway the cloth whitened under the frost and crackled when they resumed their march, but there was no time for fires, and by vigorous action he could keep the cold from striking in.
They had threaded up into the region where spring was further advanced, and within half an hour encountered another overflow. Climbing the steep bank, they wallowed through thickets waist-deep in snow. Beneath the crust, which cut knifelike, it was wet and soggy, so they emerged saturated. Then debouching on to the glare ice the boy had a nasty fall, for he slipped, and his loose-hung pack flung him suddenly. Nothing is more wicked than a pack on smooth ice. The surface had frozen glass-smooth, and constant difficulty beset their progress. Their slick-soled footgear refused to grip it, so that often they fell, always awkwardly, occasionally crushing through into the icy water beneath.
Without warning Buck found that he was very tired. He also found that his pack had grown soggy and quadrupled in weight, tugging sullenly at his aching shoulders.
As daylight showed they slipped harness and, hurriedly gathering twigs, boiled a pot of tea. They took time to prepare nothing else, yet even though the kettle sang speedily, as they drank from around the bend below came voices. Crowley straightened with a curse and, snatching his pack, fled up the stream, followed by his companion. They ran till Buck's knees failed him. Thereupon the former removed a portion of the youngster's burden, adding it to his own, and they hurried on for hours, till they fell exhausted upon a dry moss hummock. Here they exchanged footgear, as Buck now found his feet were paining him acutely, owing to the tightness of his rubber boots. They proved too small for Crowley as well, and in a few hours his feet were likewise ruined.
Noon found them limping among the bald hills of the river's source. Here timber was sparse and the snows, too, had thinned; so to avoid the convolutions of the stream they cut across points, floundering among "niggerheads"—quaint, wobbly hummocks of grass—being thrown repeatedly by their packs which had developed a malicious deviltry. This footing was infinitely worse than the reeking ice, but it saved time, so they took it.
Now, under their stiff mackinaws they perspired freely as the sun mounted, until their heavy garments chafed them beneath arms and legs. Moreover, mosquitoes, which in this latitude breed within arm's-length of snow-drifts, continually whined in a vicious cloud before their features.
Human nerves will weather great strains, but wearing, maddening, unending trivialities will break them down, and so, although their journey in miles had been inconsiderable, the dragging packs, the driving panic, the lack of food and firm footing, had trebled it.
Scaling the moss-capped saddle, they labored painfully, a hundred yards at a time. Back of them the valley unrolled, its stream winding away like a gleaming ribbon, stretching, through dark banks of fir, down to the Yukon. After incredible effort they reached the crest and gazed dully out to the southward over a limitless jangle of peaks, on, on, to a blue-veiled valley leagues and leagues across. Many square miles lay under them in the black of unbroken forests. It was their first glimpse of the Tanana. Far beyond, from a groveling group of foot-hills, a solitary, giant peak soared grandly, standing aloof, serene, terrible in its proportions. Even in their fatigue they exclaimed aloud:
"It's Mount McKinley!"