This visit to the Dornburg gave me many new ideas about classifying glacières, especially in relation to the movements of air. I was long puzzled by the German terms, _Eishöhlen_ and _Windröhren_; and it suddenly struck me, at the Dornburg, that this terminology is incorrect, when used as a classification of glacières. The presence or absence of strong, apparent draughts, cannot be considered as a test as to whether a place is or is not a glacière; the presence of ice, for at least part of the year, alone makes a glacière, and this it does whether there are or are not draughts. It seems to me more than ever clear, however, that it all depends on the movements of air, as to whether ice forms in a cave. If the movements of air take the cold air of winter into a cave, then and then only--provided there is also a water supply--do we have ice. I am now inclined to think that caves, as far as their temperatures are concerned, should be classified into caves containing ice, cold caves, ordinary normal caves, and hot caves, without reference to the movements of air. THE GLACIÈRE DE SAINT-GEORGES. From Rolle, on the north shore of the Lake of Geneva; an excellent carriage road leads in two hours and a half to Saint-Georges in the Jura. At first the way goes steeply uphill and passes through many vineyards, and afterwards it crosses level fields to Gimel, then rises through woods to Saint-Georges. On arriving there on the afternoon of August 3d, 1897, I found the street filled with evergreens, and long benches and tables; the débris of a _fête de tir_, which had lasted for two days, with dancing and banquets and, I suspect, much _vin du pays_. When I got down stairs at six o'clock next morning, all the people of the inn were sound asleep recovering from the effects of the _fête_, and instead of their calling me, I had to call them. Finally I succeeded in getting breakfast and then started in company with a first rate fellow, named Aymon Émery. [Illustration: LA GLACIÈRE DE SAINT-GEORGES. From a Photograph by E. Truand. ] We walked up through woods, in about an hour and a half, to the Glacière de Saint-Georges, which lies at an altitude of 1287 meters in the midst of the forest. There are two holes close together. One of these descends vertically and is partly roofed over with logs on which is rigged a pulley. Émery, who was the _entrepreneur_ of the glacière, which means that he attended to getting out the ice, told me that they pulled the ice up through this vertical hole, making a noose with a rope round each block.