But I am glad now, that I was forced to father my intrepid theory myself, for, on the night of which I am writing, it was triumphantly justified and established. Mont Blanc is nearly sixteen thousand feet high; he hid the moon utterly; near him is a peak which is 12,216 feet high; the moon slid along behind the pinnacles, and when she approached that one I watched her with intense interest, for my reputation as a scientist must stand or fall by its decision. I cannot describe the emotions which surged like tidal waves through my breast when I saw the moon glide behind that lofty needle and pass it by without exposing more than two feet four inches of her upper rim above it; I was secure, then. I knew she could rise no higher, and I was right. She sailed behind all the peaks and never succeeded in hoisting her disk above a single one of them. While the moon was behind one of those sharp fingers, its shadow was flung athwart the vacant heavens--a long, slanting, clean-cut, dark ray--with a streaming and energetic suggestion of FORCE about it, such as the ascending jet of water from a powerful fire-engine affords. It was curious to see a good strong shadow of an earthly object cast upon so intangible a field as the atmosphere. We went to bed, at last, and went quickly to sleep, but I woke up, after about three hours, with throbbing temples, and a head which was physically sore, outside and in. I was dazed, dreamy, wretched, seedy, unrefreshed. I recognized the occasion of all this: it was that torrent. In the mountain villages of Switzerland, and along the roads, one has always the roar of the torrent in his ears. He imagines it is music, and he thinks poetic things about it; he lies in his comfortable bed and is lulled to sleep by it. But by and by he begins to notice that his head is very sore--he cannot account for it; in solitudes where the profoundest silence reigns, he notices a sullen, distant, continuous roar in his ears, which is like what he would experience if he had sea-shells pressed against them--he cannot account for it; he is drowsy and absent-minded; there is no tenacity to his mind, he cannot keep hold of a thought and follow it out; if he sits down to write, his vocabulary is empty, no suitable words will come, he forgets what he started to do, and remains there, pen in hand, head tilted up, eyes closed, listening painfully to the muffled roar of a distant train in his ears; in his soundest sleep the strain continues, he goes on listening, always listening intently, anxiously, and wakes at last, harassed, irritable, unrefreshed. He cannot manage to account for these things.