Jaspar Hobson was not mistaken in prophesying a change in the weather. It came very soon. During the afternoon of the same day the mist became thicker, and assumed a yellowish and threatening hue. The Lieutenant, although very uneasy, allowed none of his anxiety to appear, but had a long consultation with Sergeant Long whilst the dogs of his sledge were laboriously preparing to start. Unfortunately, the district now to be traversed was very unsuitable for sledges. The ground was very uneven; ravines were of frequent occurrence; and masses of granite or half-thawed icebergs blocked up the road, causing constant delay. The poor dogs did their best, but the drivers’ whips no longer produced any effect upon them. And so the Lieutenant and his men were often obliged to walk to rest the exhausted animals, to push the sledges, or even sometimes to lift them when the roughness of the ground threatened to upset them. The incessant fatigue was, however, borne by all without a murmur. Thomas Black alone, absorbed in his one idea, never got out of his sledge, and indeed be was so corpulent that all exertion was disagreeable to him. The nature of the soil changed from the moment of entering the Arctic Circle. Some geological convulsion had evidently upheaved the enormous blocks strewn upon the surface. The vegetation, too, was of a more distinctive character. Wherever they were sheltered from the keen north winds, the flanks of the hills were clothed not only with shrubs, but with large trees, all of the same species — pines, willows, and firs — proving by their presence that a certain amount of vegetative force is retained even in the Frigid Zone. Jaspar Hobson hoped to find such specimens of the Arctic Flora even on the verge of the Polar Sea; for these trees would supply him with wood to build his fort, and fuel to warm its inhabitants. The same thought passed through the minds of his companions, and they could not help wondering at the contrast between this comparatively fertile region, and the long white plains stretching between the Great Slave Lake and Fort Enterprise. At night the yellow mist became more opaque; the wind rose, the snow began to fall in large flakes, and the ground was soon covered with a thick white carpet. In less than an hour the snow was a foot deep, and as it did not freeze but remained in a liquid state, the sledges could only advance with extreme difficulty; the curved fronts stuck in the soft substance, and the dogs were obliged to stop again and again.