A strange effect is produced, when one is descending, if the clouds are descending too; for the deepening mist then makes the delay in reaching sunlight seem endless. Down and down we go, and the gloom is still beneath us, until we begin to wonder, like the first voyagers on the Atlantic, whether we are sinking into some bottomless abyss from which it may be impossible to re-arise; it becomes a burden and nightmare to the mind; then at last there is a darkening of the vapour in one spot, and far below we see the jet-black water of a tarn, or a bit of brown mountain-side across the glen.
More inspiriting is the effect of climbing through and above the clouds, as one sometimes can do, until one looks down from an upper land of sunshine on a sea of mist below, from which the rocky peaks and promontories emerge like islands. It occasionally happens, when some high ridge is bathed in cloud on one side and in sun on the other, that a climber, standing on the edge of the gulf, will see a small circular rainbow projected on the mist, with his own head forming the centre of it--a rare and curious experience for the wayworn pilgrim, thus to find his image, like that of a saint, with a halo round his head, emblazoned on the mountain vapours! Who shall say that the modern pilgrim is not blessed, as his forerunners were, with celestial apparitions? The first time I saw this phenomenon was on the ridge of Ben Nevis. I have also seen it from Blaven, in Skye, and from the top of Scafell, looking down into the cloud-filled chasm of Mickledore.
Not less marvellous are the transformations of the clouds themselves, when, after a spell of storm, they break up under triumphant sunshine and drift disbanded along the slopes. I remember how once, descending from Tryfan after a wet and dismal day, and returning across the low grassy moorlands to Capel Curig, I witnessed that strange form of mountain mirage recorded by Wordsworth in “The Excursion.” The corner of the valley above Llyn Ogwen was filled with dense mists, which came seething and boiling out of the hollow like steam from a cauldron, and as they broke up into small wisps and wreaths, under combined wind and sunshine, gave an extraordinary appearance to the northern front of Carnedd Dafydd, which was enveloped in a maze of billowy vapour, until it was impossible to distinguish rock from cloud or cloud from rock, and the illusion was exactly that which the poet has described: