Besides building up ice heaps, the drip, also, has the function of destroying its own creations. If there are no crevasses, there are holes and runnels. These are generally found at or leading to the lowest point of the ice floor. Occasionally the holes are deep, sometimes many meters in depth. They are certainly cut out by the melting water, to which they offer an exit; in fact they are a part of the drainage system present in all glacière caves, where there must be some outlet for surplus water at or near the lowest point: and as the caves are always in porous or broken rock, the drainage takes place through the cracks and fissures. The drip produces also the exact opposite of pyramids in the shape of ice basins. These are cut in the floor by an extra strong drip from the roof at those spots. Basins exactly like these are not seen on glaciers. Not infrequently they are full of water of considerable depth. Lakes and pools are found in glacière caves. Sometimes they are on the ice floor, and in this case they are due either to rain-water collecting faster than it can flow off, or else because the cave is in a state of thaw. Sometimes these pools are among the rocks in one part of a cave, while the ice is in another part. I have said above that motion in subterranean ice is practically wanting. This is proved by the lack of crevasses on the ice slopes or ice walls, and also by the fact that basins and cones appear year after year in the same spots, where they remain whether they are increasing or diminishing. But this statement cannot be held to cover the entrance snow and ice slopes of some of the open pit caves such as the Gottscheer cave, or Saint-Livres or Haut d'Aviernoz. Here the snow, which falls on the entrance slope, must gradually gravitate to the bottom. The question is whether it only descends in the shape of water after melting or as snow before solidifying; or whether it ever slides down at all after becoming somewhat solidified. Probably, however, the ice of these slopes, judging from the fact that crevasses are entirely lacking, remains stationary. _Color Effects._--The color effect of every glacière cavern has a certain individuality, according to the color of the rocks, the quantity of ice, and the amount of daylight admitted through the entrance. In my opinion, the white note given by the ice, makes a fine glacière cave the most beautiful of all subterranean hollows. In this respect it seems to me that they are similar to high Alps, which are certainly most impressive with coverings of snow and glacier.