The shores of Belgica Channel are formed by high, mountainous table-lands with steep slopes and narrow valleys. One of the peaks appears to rise above an altitude of two thousand metres. The channels which separate these lands have steep perpendicular shores and possess great depths in their centre. The appearance of these lands and channels indicates that we have to do with a sunken region, in which the valleys were invaded by the sea. These lands are entirely formed by ancient crystalline rocks, granites, greenstones, and syenites. We have seen gneiss only at the mouth of the Pacific Strait. This fact indicates that we were in the central part of the antarctic chain, whose general direction is that of Belgica Strait. At the time of our sojourn in these regions, from the 23d of January to the 12th of February, the strait was free from ice. There were only a few icebergs. If some small islands were only partially covered with ice, all those of a larger extent and Dancoland were completely covered with an immense crust of ice which showed itself under three different forms. The interior was all occupied by a frozen sheet, which may be compared with the Greenland inland ice. Everywhere upon the mountain-sides were suspended glaciers, and in all the valleys were tremendous crystalline currents which ran into the sea. The limit of eternal snow coincides here almost to a certainty with the level of the sea. The study of the moraines allowed us to state that the glaciers had receded, and at the same time gave us a decisive information as to a much more considerable extension at an anterior epoch. The erratic materials furnish us with rocks much more varied than those found on the spot. We have even met with transformed sedimentary rocks.