Dropping down through the hole, we found ourselves in a small cavern formed of rough limestone blocks overhead and underfoot. It is possible to go still further down and my companion said that formerly it was possible to go through the cave and come out at a lower opening; this exit, however, was destroyed when the railroad was built. The draught, as tested by the flame of a candle, was still drawing in some seven or eight meters from the entrance. There is a second cavity immediately next to the entrance, and at the bottom of these holes, the inward draught was so violent as to blow the candle out. The thermometer outside in the shade was 28°C.; inside the cave, where the draught was still perceptible, it was about 20°C. Within the cave I noticed two large, dark brown spiders. On returning to the _gasthaus_, I had a talk with some peasants who were dining there, and they told me that it was warm in winter in the Nixloch, and that ice never formed there. THE DORNBURG. If one draws a line northeast from Coblentz and another northwest from Frankfort-on-the-Main, they will intersect nearly at the Dornburg. The railroad from Frankfort goes, via Limburg and Hadamar, to Frickhofen and Wilsenroth, from either of which villages the ice formations of the Dornburg are easily reached on foot in half an hour. I arrived at Wilsenroth on the 26th of July, 1897, and soon found an old forester, who said he had lived in the neighborhood for over fifty years, to show me the way. The Dornburg is a low hill, perhaps a hundred meters high and a kilometer long. It is basaltic and covered with sparse woods. The forester said that on top were the remains of the foundations of an old castle, and that this was possibly the origin of the name Dornburg. We circled round the eastern base of the hill for some ten minutes, when we came to a little depression, filled with basalt debris, among which were several small holes, out of which came currents of cool air. Ten minutes further in the woods, we arrived at the _Dornburg Restauration_ and then almost immediately at the glacière. It is at the bottom of a talus of broken basaltic rocks and has been much affected by the agency of man. In it are two _eislöcher_ or _stollen_, as the forester called them. These are little artificial pits or cellars, dug into the talus. They are side by side, opening about southeast, and each is about one and a half meters wide, three meters long, and two meters high. The sides are built up with wooden posts and overhead is a thick roof of logs strewn with dirt. The day was cool and at the mouth of each _eisloch_, a faint outward current of air was discernible at nine-thirty A. M. I could not find any currents coming into the _eislöcher_. Inside it was cold and damp, and evidently thawing. There was a good heap of ice in each _eisloch_; it was clear, and I could detect no trace of prisms.