Belleek. The justly admired porcelain ware of Bel- leek, Co. Fermanagh, is obtained from an orthoclase granite in the vicinity of the factory which is situated at the spot where the waters of Lough Erne precipitate themselves along a series of cascades into the river of the same name. In general, porcelain is made from granitic rocks in a decomposed state, known as kaolin; but in this case the red orthose felspar retains its crystalline form in its original perfection, and on being 1 calcined loses colour and becomes white. The metallic iron which separates itself from the rock during the process of calcination is afterwards extracted by simply immersing magnets into the powdered china clay when mixed with water ; the particles of iron then adhere to the magnets, and are lifted out. It is probably this rock which is de scribed by Mr. R. H. Scott, Sir R. Griffith, and the Rev. Dr. Ilaughton, as occurring in veins pene trating gneiss and schist. 1 Arranmore Island. Porphyritic granite, consisting of quartz, reddish felspar, and black mica. In this granite the felspar predominates. Tory Island. Coarse granite, almost entirely com posed of quartz and felspar, a little mica, green or white. 2 1 Brit. Assoc. Rep. 1863, ‘ On the Granites of Donegal,’ p. 54. 2 Brit. Assoc. Rep. 1863.