SPECIES. { 1. Granite. { 2. Gneiss. { 3. Mica slate. { 4. Clay slate. { 5. Primitive limestone. { 6. Primitive trap. { 7. Serpentine. { I. PRIMITIVE. { 8. Porphyry. { { 9. Sienite. { {10. Topaz rock. { {11. Quartz rock. { {12. Primitive flinty slate. { {13. Primitive gypsum. { {14. White stone. { { { 1. Transition limestone. { { I. TRANSITION { 2. Transition trap. { { ROCKS. { 3. Grey wacke. { { { 4. Transition flinty slate. { { { 5. Transition gypsum. { { { II. SECONDARY. { { 1. Old red sandstone. { { { 2. Floetz limestone. { { { 3. Floetz gypsum. { { { 4. Second, or variegated sandstone. { { { 5. Second floetz gypsum. { { II. FLOETZ { 6. Shell limestone. { { ROCKS. { 7. Third sandstone. { { 8. Rock salt. { { 9. Chalk. { {10. Floetz trap. { {11. Coal. { {12. Newest floetz trap. { { { 1. Peat. { { 2. Sand and gravel. { III. ALLUVIAL. { 3. Loam. { { 4. Bog iron ore. { { 5. Calcareous tufa, &c. { { { 1. Burnt clay. { { I. PSEUDO VOLCANIC { 2. Porcelain jasper. { { ROCKS. { 3. Earth slag. { { { 4. Columnar clay ironstone. { IV. VOLCANIC. { { 5. Polishing slate. { { II. TRUE VOLCANIC { 1. Stones and ashes. { ROCKS. { 2. Lava. { 3. Matter of muddy eruptions.