As I continued to sit upon the dump, I began to observe that this sea was not so level as at first sight it appeared to be. Away in the extreme south, a little hill of fog arose against the sky above the general surface, and as it had already caught the sun, it shone on the horizon like the topsails of some giant ship. There were huge waves, stationary, as it seemed, like waves in a frozen sea; and yet, as I looked again, I was not sure but they were moving after all, with a slow and august advance. And while I was yet doubting, a promontory of the hills some four or five miles away, conspicuous by a bouquet of tall pines, was in a single instant overtaken and swallowed up. It appeared in a little, with its pines, but this time as an islet, and only to be swallowed up once more and then for good. This set me looking nearer, and I saw that in every cove along the line of mountains the fog was being piled in higher and higher, as though by some wind that was inaudible to me. I could trace its progress, one pine-tree first growing hazy and then disappearing after another; although sometimes there was none of this fore-running haze, but the whole opaque white ocean gave a start and swallowed a piece of mountain at a gulp. It was to flee these poisonous fogs that I had left the seaboard, and climbed so high among the mountains. And now, behold, here came the fog to besiege me in my chosen altitudes, and yet came so beautifully that my first thought was of welcome. The sun had now gotten much higher, and through all the gaps of the hills it cast long bars of gold across that white ocean. An eagle, or some other very great bird of the mountain, came wheeling over the nearer pine-tops, and hung, poised and something sideways, as if to look abroad on that unwonted desolation, spying, perhaps with terror, for the eyries of her comrades. Then, with a long cry, she disappeared again towards Lake County and the clearer air. At length it seemed to me as if the flood were beginning to subside. The old landmarks, by whose disappearance I had measured its advance, here a crag, there a brave pine-tree, now began, in the inverse order, to make their reappearance into daylight. I judged all danger of the fog was over. This was not Noah's flood; it was but a morning spring, and would now drift out seaward whence it came. So, mightily relieved, and a good deal exhilarated by the sight, I went into the house to light the fire. I suppose it was nearly seven when I once more mounted the platform to look abroad. The fog ocean had swelled up enormously since last I saw it; and a few hundred feet below me, in the deep gap where the Toll House stands and the road runs through into Lake County, it had already topped the slope, and was pouring over and down the other side like driving smoke. The wind had climbed along with it; and though I was still in calm air, I could see the trees tossing below me, and their long, strident sighing mounted to me where I stood.