The sun was still concealed below the opposite hilltops, though it was shining already, not twenty feet above my head, on our own mountain slope. But the scene, beyond a few near features, was entirely changed. Napa Valley was gone; gone were all the lower slopes and woody foot-hills of the range; and in their place, not a thousand feet below me, rolled a great level ocean. It was as though I had gone to bed the night before, safe in a nook of inland mountains, and had awakened in a bay upon the coast. I had seen these inundations from below; at Calistoga I had risen and gone abroad in the early morning, coughing and sneezing, under fathoms on fathoms of grey sea-vapour, like a cloudy sky--a dull sight for the artist, and a painful experience for the invalid. But to sit aloft one's self in the pure air and under the unclouded dome of heaven, and thus look down on the submergence of the valley, was strangely different and even delightful to the eyes. Far away were hilltops like little islands. Nearer, a smoky surf beat about the foot of precipices and poured into all the coves of these rough mountains. The colour of that fog ocean was a thing never to be forgotten. For an instant, among the Hebrides and just about sundown, I have seen something like it on the sea itself. But the white was not so opaline; nor was there, what surprisingly increased the effect, that breathless, crystal stillness over all. Even in its gentlest moods the salt sea travails, moaning among the weeds or lisping on the sand; but that vast fog ocean lay in a trance of silence, nor did the sweet air of the morning tremble with a sound.