The weather had grown steadily colder since we reached the Yukon slope, and for two days before reaching Circle the thermometer had stood between 40° and 50° below zero. It was all right for us to push on, the trail was good and nearly all down-hill, and there were road-houses every ten or twelve miles. Freighters, weather-bound, came to the doors as we passed by with our jangle of bells and would raise a somewhat chechaco pride in our breasts by remarking: "You don't seem to care what weather you travel in!" The evil of it was that the perfectly safe travelling between Eagle Creek and Circle emboldened us to push on from Circle under totally different conditions, when travelling at such low temperatures became highly dangerous and brought us into grave misadventure that might easily have been fatal catastrophe. Our original start was a week later than had been planned and we had made no time, but rather lost it, on this first division of the journey. If we were to reach Bettles on the Koyukuk River for Christmas, there was no more time to lose, and I was anxious to spend the next Sunday at Fort Yukon, three days' journey away. So we started for Fort Yukon on Thursday, the 7th of December, the day after we reached Circle. [Sidenote: THE YUKON FLATS] A certain arctic traveller has said that "adventures" always imply either incompetence or ignorance of local conditions, and there is some truth in the saying. Our misadventure was the result of a series of mistakes, no one of which would have been other than discreditable to men of more experience. Our course lay for seventy-five miles through the Yukon Flats, which begin at Circle and extend for two hundred and fifty miles of the river's course below that point. The Flats constitute the most difficult and dangerous part of the whole length of the Yukon River, summer or winter, and the section between Circle City and Fort Yukon is the most difficult and dangerous part of the Flats. Save for a "portage" or land trail of eighteen or twenty miles out of Circle, the trail is on the river itself, which is split up into many channels without salient landmarks. The current is so swift that many stretches run open water far into the winter, and blow-holes are numerous. There is little travel on the Flats in winter, and a snow-storm accompanied by wind may obliterate what trail there is in an hour. The vehicle used in the Flats is not a sled but a toboggan, and our first mistake was in not conforming to local usage in this respect. There is always a very good reason for local usage about snow vehicles. But a toboggan which had been ordered from a native at Fort Yukon would be waiting for us, and it seemed not worth while to go to the expense of buying another merely for three days' journey.