THE LEWIS BROOKS MUSEUM. 9 



this series we find illustrated the various forms of sand- 

 stone, conglomerate, grit, &c. 



Class 10. — Argillaceous Rocks. — The clays, marls, &c, 

 which compose this class, may be considered as the more 

 finely comminuted states of the preceding class. 



We find illustrated here common clays, porcelain clay, 

 loess, tripoli, &c. 



Glass 11. — Carbonaceous Rocks.— In this final class is 

 placed a group of substances chiefly of vegetable origin, 

 which are more or less carbonized. In this class the vari- 

 ous coals, lignites, jet, peat, &c, are illustrated, with bitu- 

 minous slate, &c. 



Section II. — Metallurgy. — This section consists of a 

 series of ores composed of about 300 specimens. They give 

 a full illustration of the ores of the metals most used in the 

 arts. 



Class 1. — Ores of Iron. — This class contains specimens 

 of magnetic and specular ore from various localities, as well 

 as chromic iron, spathic iron, hematite, &c, &c. 



Class 2. — Ores of Manganese. — This class contains pyro- 

 lusite, wad, &c, &c, from American and European local- 

 ities. 



Class 3. — Ores of Copper. — This contains native copper, 

 oxides of copper, sulphides of do., &c, &c, from Lake Su- 

 perior, Brazil, Cornwall, Siberia, Saxony, Australia, &c. 



Class 4. — Ores of Lead. — This class contains galena, 

 the sulphate, phosphate and carbonate of lead, and other 

 ores from many localities in Europe and America. 



Class 5. — Ores of Tin. — This contains the ores of tin 

 from Cornwall, Saxony, &c. 



Class 6. — Ores of Zinc. — This class contains the vari- 

 ous ores of zinc from New Jersey, England, Saxony, Sibe-? 

 ria, &c. 



Class 7. — Ores of Mercury. — This contains cinnabar 

 from California, Spain } Austria, &c. 



