The entrance to Dóbsina faces nearly due north. It is small, perhaps two meters wide and three meters high, and is perfectly sheltered from any wind. The sudden drop in temperature at the entrance was startling; in fact it was the most extreme change I have noticed in any cave. Within the length of an ordinary room, say in a distance of five meters, we passed from an extremely hot summer morning to the chill of a mid-winter afternoon. A slight air current, perhaps, issued from the entrance, as we observed a faint mist there. At the rock portal there was ice on the rocks overhead, and underfoot was the beginning of the huge mass of ice which almost fills the cavern. A descent down eighteen wooden steps landed us at the beginning of a great ice floor, in what is called the _Grosser Saal_. It is a magnificent cave. The floor is a sheet or rather a mass of solid ice, the surface of which is level enough in one place to permit of skating; in other spots it is sloping and covered with small ice hillocks. The ice is solid throughout, without any holes or cracks. Several fissure columns stream to the floor from cracks in the sides. Joining the roof to the floor are numerous big ice stalactites, which form frozen pillars and columns. These are from eight to eleven meters in height, and some two to three meters in average breadth and width. Nearly translucent, they are covered with all sorts of icy ornaments hanging about them in tufts and fringes; they are beautiful in their shapes, as well as in their white and blue colors. One of these columns is called the _Brunnen_, because until about ten years ago, a small stream dribbled continuously from the roof and cut a channel across the ice floor; but now the stream has solidified into the pillar, and the channel is filled up, although it can still be traced in the ice. The cavern is lighted by electricity, which has the merit, even if it brings in an element of artificiality, of clearly revealing one of the chief glories of Dóbsina. This is the rime or hoar frost, which in the shape of ice or snow crystals, covers the entire limestone roof, and, reflecting the electric light, shines like frosted silver. Some of these frost crystals seem to be precipitated to the floor, and in one place I found a small sheet of them, perhaps two meters in width each way, which looked and felt like genuine snow. The general color effect of all this upper cave is white, although there is some blue in the ice, and gray and brown in the rocks and shadows. It would not be much of a misnomer to call Dóbsina "the great white cave."