I saw Professor Gregg walking up and down the terrace path below the windows, and it was evident that he was revelling in the sense of liberty, and the thought that he had, for a while, bidden good-bye to task-work. When I joined him there was exultation in his voice as he pointed out the sweep of valley and the river that wound beneath the lovely hills. "Yes," he said, "it is a strangely beautiful country; and to me, at least, it seems full of mystery. You have not forgotten the drawer I showed you, Miss Lally? No; and you have guessed that I have come here not merely for the sake of the children and the fresh air?" "I think I have guessed as much as that," I replied; "but you must remember I do not know the mere nature of your investigations; and as for the connection between the search and this wonderful valley, it is past my guessing." He smiled queerly at me. "You must not think I am making a mystery for the sake of mystery," he said. "I do not speak out because, so far, there is nothing to be spoken, nothing definite I mean, nothing that can be set down in hard black and white, as dull and sure and irreproachable as any blue book. And then I have another reason: many years ago a chance paragraph in a newspaper caught my attention, and focussed in an instant the vagrant thoughts and half-formed fancies of many idle and speculative hours into a certain hypothesis. I saw at once that I was treading on a thin crust; my theory was wild and fantastic in the extreme, and I would not for any consideration have written a hint of it for publication. But I thought that in the company of scientific men like myself, men who knew the course of discovery, and were aware that the gas that blazes and flares in the gin-palace was once a wild hypothesis; I thought that with such men as these I might hazard my dream--let us say Atlantis, or the philosopher's stone, or what you like--without danger of ridicule. I found I was grossly mistaken; my friends looked blankly at me and at one another, and I could see something of pity, and something also of insolent contempt, in the glances they exchanged. One of them called on me next day, and hinted that I must be suffering from overwork and brain exhaustion. 'In plain terms,' I said, 'you think I am going mad. I think not;' and I showed him out with some little appearance of heat. Since that day I vowed that I would never whisper the nature of my theory to any living soul; to no one but yourself have I ever shown the contents of that drawer. After all, I may be following a rainbow; I may have been misled by the play of coincidence; but as I stand here in this mystic hush and silence amidst the woods and wild hills, I am more than ever sure that I am hot on the scent. Come, it is time we went in."