As this mighty column loomed up above its icy background, its presence was thought-provoking as well as awe-inspiring. It seemed like some sentinel placed here to guard the gateway to this unknown northern sea. But when was it built? and for what purpose? were questions that were continually forced upon our minds. As to the time: it must have been before the great ice age, when tropical plants as well as animals, flourished in the far north, and a tropical, or semi-tropical climate extended from the equator to the poles. But this did not indicate the purpose for which it was erected. Was it an observatory for astronomical purposes, or a light-house for the guidance of the pre-historic navigators of these waters, now locked in the embrace of almost impassable ice barriers? Who could tell? All we could do for the present was to record our observations. The tower was there, two hundred feet in height, and its latitude was 85° north, and longitude 180° west. This was all that we could learn for the present. As had been the experience of all other navigators in high northern latitudes, the dipping of the needle rendered the compass useless, and we had to depend on the sun, moon and stars for our guidance. But the skies were clear and the sea open, so that we apprehended no further trouble, notwithstanding this was the beginning of winter. Accounts of the expedition were sealed in bottles and sent up in balloons, as was our custom, and as there was no ice in sight, we determined to sail due north from the tower. After holding our course for a few days, we found that the needle had again assumed the horizontal position and that we were sailing due south. We knew we had started north and had not consciously changed our course. Here was a mystery we could not fathom. But this was not all. The horizon seemed to be rising up and obscuring stars that ought to have been in full view. The pole star, which had been near the zenith was sinking toward the horizon behind us. The whole face of the celestial vault was changing. As the northern lights, which were dropping to the rear grew less brilliant, the southern horizon beamed with a halo of light, which continued to grow brighter. Without having changed our course we were now sailing away from the constellations by which we had so long been guided in our progress toward the pole. What could it mean? These strange phenomena upset all of our calculations. Everything seemed weird and unnatural. The engines were stopped and we lay to, in order to make observations and study the situation. Accounts of these strange phenomena were securely sealed in bottles and committed to the care of the winds.