This afternoon I was the not altogether passive spectator of a curious scene in natural history. My feet encased in stout "tackety" boots, I had waded down two of Waster Lunny's fields to the glen burn: in summer the never-failing larder from which, with wriggling worm or garish fly, I can any morning whip a savoury breakfast; in the winter-time the only thing in the valley that defies the ice-king's chloroform. I watched the water twisting black and solemn through the snow, the ragged ice on its edge proof of the toughness of the struggle with the frost, from which it has, after all, crept only half victorious. A bare wild rosebush on the further bank was violently agitated, and then there ran from its root a black-headed rat with wings. Such was the general effect. I was not less interested when my startled eyes divided this phenomenon into its component parts, and recognized in the disturbance on the opposite bank only another fierce struggle among the hungry animals for existence: they need no professor to teach them the doctrine of the survival of the fittest. A weasel had gripped a water-hen (whit-rit and beltie they are called in these parts) cowering at the root of the rose-bush, and was being dragged down the bank by the terrified bird, which made for the water as its only chance of escape. In less disadvantageous circumstances the weasel would have made short work of his victim; but as he only had the bird by the tail, the prospects of the combatants were equalized. It was the tug-of-war being played with a life as the stakes. "If I do not reach the water," was the argument that went on in the heaving little breast of the one, "I am a dead bird." "If this water-hen," reasoned the other, "reaches the burn, my supper vanishes with her." Down the sloping bank the hen had distinctly the best of it, but after that came a yard of level snow, and here she tugged and screamed in vain. I had so far been an unobserved spectator; but my sympathies were with the beltie, and, thinking it high time to interfere, I jumped into the water. The water-hen gave one mighty final tug and toppled into the burn; while the weasel viciously showed me his teeth, and then stole slowly up the bank to the rose-bush, whence, "girning," he watched me lift his exhausted victim from the water, and set off with her for the schoolhouse. Except for her draggled tail, she already looks wonderfully composed, and so long as the frost holds I shall have little difficulty in keeping her with me. On Sunday I found a frozen sparrow, whose heart had almost ceased to beat, in the disused pig-sty, and put him for warmth into my breast-pocket. The ungrateful little scrub bolted without a word of thanks about ten minutes afterwards to the alarm of my cat, which had not known his whereabouts.