By much questioning, I dug out something of the history of these _stollen_ from the forester. Formerly the ice was found at this spot, among the boulders at the base of the slope. But the people gradually took many of these basaltic blocks away, to break up for road making, and then the ice diminished. About 1870, a brewery, since burnt, was built at the Dornburg and the brewer had these _stollen_ built, a sort of semi-natural, semi-artificial ice house. Every winter, the present owner of the _stollen_ throws a quantity of snow into them, and this helps materially in forming the mass of ice. Just below the restaurant there is a spring, which was said to be extremely cold, but there was nothing icy nor apparently unusual about it. Under the restaurant itself is an interesting cellar. It was closed by wooden doors. First there was a passage way which turned steadily to the right, and which we descended by some ten steps. This was about two meters wide and was full of beer bottles and vegetables. On the left of the passage was a large double chamber where meat is kept. At eleven-thirty A. M. a faint draught blew down the passage and into the hall, the outside door being then open. The double hall was perhaps six meters each way, and I could detect no air currents coming into it at any place, except from the passage way. Both passage and halls were, as far as I could see, entirely built over with masonry. There was no ice and the temperature was some 7° or 8° above freezing point. The daughter of the proprietor of the restaurant said that ice began to form in the cellar in February and that it lasted generally until October; but that this year it was destroyed early because the masonry was repaired, although it was still possible to skate in the cellar as late as March. In the beginning of winter the cellar was warm, and as she expressed it, _der Keller schwitzt dann_, which I suppose means that the walls are damp. She also said that it was a _naturlicher Keller_, and I am inclined to think that it was a natural glacière, converted into a cellar.