How came these there? Was this a tomb? I felt about for more relics, going hither and thither in the earnestness of quest, but found no more. I had now been in this dungeon upward of an hour, and felt inclined to return as speedily as possible to the daylight. I searched for the place where I had got up from the narrow passage. I groped this way and that; and this had to be done with precaution, for who could tell where I might not step off suddenly and fall to some great depth? Yet I could find nothing that promised to lead me to the passage by which I had come. Where was I? What was I to do? Remaining still would never do; to keep moving, moving, was the only course to pursue. I had, I knew not how, emerged from that low-roofed recess, and stood now in what seemed to be a vast chamber where there were neither sides nor roof. I hallooed that I might hear the echo from its walls, and perhaps in that way find them. I was startled, almost frightened, at the solemn mocking sounds that reverberated through the lonely cavern. I grew fearful of my own voice. At last I sank down exhausted, and slept. I awoke, and groped about once more. This occurred again and again. How often I lay down to sleep I cannot tell. Sometimes I thought of the skeleton I had stumbled over, and wondered if my bones, too, would here find their resting-place. Then I thought of the grand, lofty mountain overhead. What a stupendous monument! But what would I not have given for deliverance from it! (_To be continued._) [Illustration: THE HOUSE THAT JACK BUILT, BY OUR JAPANESE ARTIST] HOW TO MAKE AN ICE-BOAT. BY J. H. HUBBARD. The sport of sailing on the ice has within a few years attracted considerable attention on our northern rivers and lakes, and seems likely to increase. It is an amusement well adapted to big boys, being exciting, requiring skill, and certainly not more dangerous than skating. It is even more fascinating than yachting, without the danger which always attends the latter pursuit. A small ice-boat that a boy can build will sail ten to twenty miles an hour with a good wind. Some large ones, strange as it may seem, can sail, with a wind on the beam, actually faster than the wind which is blowing. This fact is attested by the highest scientific authorities. Having seen some unsuccessful attempts at ice-boats by boys in various places, I propose to tell you how to build one, at a small expense, that will sail well, and give you a great deal of sport. [Illustration: FIG. 1.] The directions and measurements here given are the result of careful experiments and some failures. Fig. 1 is an elevation, Fig. 2 a ground-plan of the frame, and Fig. 3 a section of a runner. Get a spruce plank, A, 12 feet long, 6 inches wide, 2 inches thick. This is the backbone of the structure. Cut near one end of it a hole two inches square to receive the foot of the mast. [Illustration: Fig. 2.]