"It fell at my feet a moment ago." Hall glanced in a startled manner at the sky, and then down the slope of the mountain. "Did you notice in what direction it was flying?" he asked. "No, it dropped so close that it almost grazed my nose. I saw nothing of it until it made me blink." "I have been heedless," muttered Hall under his breath. At the time I did not notice the singularity of his remark, my attention being absorbed in contemplating the unfortunate tanager. "Look how its feathers are scorched," I said. "I know it," Hall replied, without glancing at the bird. "And it is covered with a film of artemisium," I added, a little piqued by his abstraction. "I know that, too." "See here, Hall," I exclaimed, "are you trying to make game of me?" "Not at all, my dear fellow," he replied, dropping his cogitation. "Pray forgive me. But this is no new phenomenon to me. I have picked up birds in that condition on this mountain before. There is a terrible mystery here, but I am slowly letting light into it, and if we succeed in reaching the top of the peak I have good hope that the illumination will increase." "Here now," he added a moment later, sitting down upon a rock and thrusting the blade of his penknife into a crevice, "what do you think of this?" He held up a little nugget of pure artemisium, and then went on: "You know that all this slope was swept as clean as a Dutch housewife's kitchen floor by the thousands of miners and prospectors who swarmed over it a year or two ago, and do you suppose they would have missed such a tidbit if it had been here then?" "Dr. Syx must have been salting the mountain again," I suggested. "Well," replied Hall, with a significant smile, "if the doctor hasn't salted it somebody else has, that's plain enough. But perhaps you would like to know precisely what I expect to find out when we get on the topknot of the Teton." "I should certainly be delighted to learn the object of our journey," I said. "Of course, I'm only going along for company and for the fun of the thing; but you know you can count on me for substantial aid whenever you need it." "It is because you are so willing to let me keep my own counsel," he rejoined, "and to wait for things to ripen before compelling me to disclose them, that I like to have you with me at critical times. Now, as to the object of this break-neck expedition, whose risks you understand as fully as I do, I need not assure you that it is of supreme importance to the success of my plans. In a word, I hope to be able to look down into a part of Dr. Syx's mill which, if I am not mistaken, no human eye except his and those of his most trustworthy helpers has ever been permitted to see. And if I see there what I fully expect to see, I shall have got a long step nearer to a great fortune." "Good!" I cried. "_En avant_, then! We are losing time." X THE TOP OF THE GRAND TETON