Happy, truly, is the naturalist. He has no time for melancholy dreams. The earth becomes to him transparent; everywhere he sees significancies, harmonies, laws, chains of cause and effect endlessly interlinked, which draw him out of the narrow sphere of self-interest and self-pleasing, into a pure and wholesome region of solemn joy and wonder. He goes up some Snowdon valley; to him it is a solemn spot (though unnoticed by his companions), where the stag’s-horn clubmoss ceases to straggle across the turf, and the tufted alpine clubmoss takes its place: for he is now in a new world; a region whose climate is eternally influenced by some fresh law (after which he vainly guesses with a sigh at his own ignorance), which renders life impossible to one species, possible to another. And it is a still more solemn thought to him, that it was not always so; that æons and ages back, that rock which he passed a thousand feet below was fringed, not as now with fern and blue bugle, and white bramble-flowers, but perhaps with the alp-rose and the “gemsen-kraut” of Mont Blanc, at least with Alpine Saxifrages which have now retreated a thousand feet up the mountain side, and with the blue Snow-Gentian, and the Canadian Sedum, which have all but vanished out of the British Isles. And what is it which tells him that strange story? Yon smooth and rounded surface of rock, polished, remark, across the strata and against the grain; and furrowed here and there, as if by iron talons, with long parallel scratches. It was the crawling of a glacier which polished that rock-face; the stones fallen from Snowdon peak into the half-liquid lake of ice above, which ploughed those furrows. Æons and æons ago, before the time when Adam first “Embraced his Eve in happy hour, And every bird in Eden burst In carol, every bud in flower,” those marks were there; the records of the “Age of ice;” slight, truly; to be effaced by the next farmer who needs to build a wall; but unmistakeable, boundless in significance, like Crusoe’s one savage footprint on the sea-shore; and the naturalist acknowledges the finger-mark of God, and wonders, and worships.