One hundred and twenty-nine on the thermometer constitutes a very hot day, yet such a temperature is but ninety-seven degrees above freezing.

Double this difference, and possibly some slight conception may be gained of the cold through which Kama and Daylight travelled between dark and dark and through the dark.
Kama froze the skin on his cheek-bones, despite frequent rubbings, and the flesh turned black and sore.

Also he slightly froze the edges of his lung-tissues--a dangerous thing, and the basic reason why a man should not unduly exert himself in the open at sixty-five below.

But Kama never complained, and Daylight was a furnace of heat, sleeping as warmly under his six pounds of rabbit skins as the other did under twelve pounds.
On the second night, fifty more miles to the good, they camped in the vicinity of the boundary between Alaska and the Northwest Territory.
The rest of the journey, save the last short stretch to Dyea, would be travelled on Canadian territory.

With the hard trail, and in the absence of fresh snow, Daylight planned to make the camp of Forty Mile on the fourth night.