The window was the one depicting the rebellion of the sons of Korah; it was a vivid representation of the earth opening under the feet of the guilty men, and was brilliant with yellow and crimson flames arising from the abyss. Through the open pridella I could see "Sugar Loaf," the latter a hill of a peculiar conical shape that rose directly from the meadows watered by the little river Whippany. Its distance from the house was about half a mile, and it was covered with a dense growth of oaks and beeches. Now that I had the glasses focussed I understood what Warriner was driving at. Framed in the square of the pridella was a small opening in the leafy wall; it looked as though a shelf had been cut out of the cliff face, and evidently with a purpose. But what sort of a purpose? "An observation post," I hazarded. Warriner nodded. "Something like that was in my own mind," he said. "What do you say to our walking over there and making a reconnaissance?" "Just as you like," I assented. "Anyway it will be a pleasant stroll." Supplying ourselves with the primal necessities of stout sticks and brierwood pipes we set out. Gyp, an Irish terrier, looked longingly upon us, and Warriner, after a momentary hesitation, told him that he might accompany the expedition; whereupon there followed much staccato yelping and the apparent vision of one small dog in several places at once. The side of the hill facing the "Hundred" was rather too steep for comfortable climbing; moreover, there seemed to be a wagon road, on the right hand slope, which promised a practicable means of ascent. We walked across the lawn and a horse paddock to the Whippany, following the bank of the stream to where it was crossed by a picturesque stone bridge. Straight on lay the road to Lynn C. H., while our woodland way branched off to the left. It was pleasantly cool in the woods, and inside of twenty minutes we were well up on the hillside, and the library wing of the "Hundred" was in plain view. But there was still no sign of "Warriner's Shelf," as I chose to dub it, and I began to chaff him gently. However Gyp, by way of repaying the favor of being allowed to join us, pushed an inquisitive nose into a mass of tangled wild grapevines. Here was plain token of human progress, and we followed the narrow trail that presently dipped down sharply and then around the shoulder of a big, square rock.