It was a dead world, and furthermore, a gray world. The weather was sharp and clear; there was no moisture in the atmosphere, no fog nor haze; yet the sky was a gray pall. The reason for this was that, though there was no cloud in the sky to dim the brightness of day, there was no sun to give brightness. Far to the south the sun climbed steadily to meridian, but between it and the frozen Yukon intervened the bulge of the earth. The Yukon lay in a night shadow, and the day itself was in reality a long twilight-light. At a quarter before twelve, where a wide bend of the river gave a long vista south, the sun showed its upper rim above the sky-line. But it did not rise perpendicularly. Instead, it rose on a slant, so that by high noon it had barely lifted its lower rim clear of the horizon. It was a dim, wan sun. There was no heat to its rays, and a man could gaze squarely into the full orb of it without hurt to his eyes. No sooner had it reached meridian than it began its slant back beneath the horizon, and at quarter past twelve the earth threw its shadow again over the land. The men and dogs raced on. Daylight and Kama were both savages so far as their stomachs were concerned. They could eat irregularly in time and quantity, gorging hugely on occasion, and on occasion going long stretches without eating at all. As for the dogs, they ate but once a day, and then rarely did they receive more than a pound each of dried fish. They were ravenously hungry and at the same time splendidly in condition. Like the wolves, their forebears, their nutritive processes were rigidly economical and perfect. There was no waste. The last least particle of what they consumed was transformed into energy. And Kama and Daylight were like them. Descended themselves from the generations that had endured, they, too, endured. Theirs was the simple, elemental economy. A little food equipped them with prodigious energy. Nothing was lost. A man of soft civilization, sitting at a desk, would have grown lean and woe-begone on the fare that kept Kama and Daylight at the top-notch of physical efficiency. They knew, as the man at the desk never knows, what it is to be normally hungry all the time, so that they could eat any time. Their appetites were always with them and on edge, so that they bit voraciously into whatever offered and with an entire innocence of indigestion.