amongst the conglomerate beds of the New Red Sandstone of England. A fine bed of red jasper is found on the eastern shore of Loch Lomond, north of the pass of Balmaha ; in bog iron ore at Briesgau in Germany ; in the form of pebbles from the sand of the Nile or Desert of Egypt. 1 Fine specimens of riband and other jaspers are obtained from the river Korgon in the Altai, and Orenburg in Siberia. 2 Heliotrope from the Island of Rum, Scotland; Ice land ; and Silesia. 3 At Sherbrooke in Canada there is a large bed passing into jasperry iron-ore; and another at Riviere Quelle. Fine pebbles are found in the jasper conglomerate of the Huronian series on the north shore of Lake Huron. 4 In the U.S. red jasper occurs on the banks of the Hudson at Troy, and at Sangus near Boston, Mass.; yellow jasper along with chalcedony at Chester, Mass. ; heliotrope occupies veins in slate at Bloomimgrove, Orange County, N.Y. 5 (g) Opal being a precious, rather than an orna mental stone, its description here would be foreign to the purpose of this treatise. 1 B. von Cotta, Bocks class. Eng. ver. p. 6. 2 Of which there are specimens in the Museum of Practical Geo logy. In the mountains near the river Korgon in the Altai is a mass of jasper 300 feet thick resting on a mass of porphyry. 3 Hunt, Descrip. Guide M. P. P. p. 142. 4 Logan, Geol. of Canada, p. 834. 5 Dana, Man. Min. p. 138.