But through, and in, and between it all, the boles of the trees, and the bars of the gate, the ridge of the ruts, and dapples of lawn, one thing Amy observed which puzzled her, for even she knew that it was a thing against all usage. The thaw was not on the south side or the south–east side of anything, though the sickly sun was gazing there; but the melting came from the north, and took the frost aback. She wondered vainly about it, but the matter was simple enough, like most of the things which we wonder at, instead of at our own ignorance. A flaw of warm air from the north had set in; a lower warp which shot through and threaded the cold south–eastern woof. This is not a common occurrence. Since my vague, unguided, and weak observations began, I have only seen it thrice. And on each of those three times it has been followed by a fearful tempest. Usually, a frost breaks up with a shift of the wind to the south–east, a gradual relaxing, a fusion of warmer air, and a great effusion of damp, a blanket of clouds for the earth, and a doubt in the sky how to use them. Then the doubt ends—as many other doubts end—in precipitation. The wind chops round to the west of south; the moisture condenses outside our windows, instead of starring the inside; and then come a few spits of rain. But the rain is not often heavy at first, although it is stinging and biting,—a rain which is half ashamed of itself, as if it ought to be hail. But, after all, these things depend on things we cannot depend upon,—moods of the air to be multiplied into humours of the earth and sea, and the product traversed, indorsed, divided, touched, and sliced at every angle by solar, lunar, and astral influences. “Felix qui potuit rerum cognoscere causas.” Lucky the man who knows when to take out his umbrella. That morning, the north wind crept along, sponging the rime from the grass, and hustling it rudely from the tree–sprays, on many of which the black leaves draggled, frozen while yet in verdure. Then the sky began to be slurred across with white clouds breathing out from it, as a child breathes on the blade of a knife, or on a carriage window. These blots of cloud threw feelers out, and strung themselves together, until a broad serried and serrate bar went boldly across the heavens, from south–east to north–west. It marked the point whence the gale would begin, and the quarter where it would end. From this great bar, on either side, dappled and mottled, like the wash of sepia on a drawing, little offsets straggled away, and began to wisp with a spiral motion, slow and yet perceptible.