CONTENTS. v 



TAGE 



taceans of the Devonian. 9. Fishes of the Devonian. 10. The Silurian 

 System. 11. Subdivisions of the Silurian System. 12. Silurian System 

 of England. 13. Silurian Strata of Staffordshire. 14. The Clent Hills. 

 15. The Wrekin. 16. The Malvern Hills. 17. Silurian Strata of Europe 

 and America. 18. Fossils of the Silurian System. 19. Silurian Zoo- 

 phytes and Mollusca. 20. Silurian Gasteropoda and Cephalopoda. 

 21. Silurian Annelides and Crustaceans. 22. Visual Organs of the 

 Trilobites. 23. Fishes of the Silurian System. 24. The Cumbrian or 

 Schistose System. 25. Structure of Slate Rocks. 26. Slate Rocks of 

 Shropshire and Cumberland. 27. Review of the Silurian and Cumbrian 

 Systems. 



6. LECTURE VIII. Part II.— The Volcanic and Hypogene or Plu- 

 tonic Rocks ' 805—902 



1. Introductory. 2. Nature of Volcanic action. 3. Earthquakes. 4. 

 Earthquake of Lisbon. 5. Phlegraean Fields, and the Lipari Isles. 

 6. Ischia and Vesuvius. 7. Structure of Volcanic mountains. 8. Vol- 

 canic products. 9. Lava currents, Dikes, and Veins. 10. Eruptions 

 of Vesuvius. 11. Herculaneum and Pompeii. 12. Conservative effects 

 of Lava streams. 13. Organic remains in Lava. 14. Mount Etna. 

 15. Val del Bove. 16. Volcano of Kirauea. 17. Mr. Stewart's visit 

 to Kirauea. 18. Volcano of Jorullo. 19. Submarine Volcanoes. 20. 

 Summary of Volcanic phenomena. 21. Hypogene rocks. 22. Mica-schist 

 and Gneiss. 23. Contorted Crystalline rocks. 24. Basalt or Trap. 25. 

 Isleof Staffa. 26. Strata altered from contact with Basalt. 27. Trap 

 dikes in the Isle of Sky. 28. Granite. 29. Granitic eruptions. 30. Meta- 

 morphism of rocks. 31. Precious stones. 32. Metalliferous veins. 33. 

 Auriferous alluvia. 34. Cupreous deposits. 35. Transmutation of Metals. 

 36. Review of the Hypogene rocks. 37. Organic remains in metamor- 

 phic rocks. 38. Chronology of Mountain-chains. 39. Systems of eleva- 

 tion. 40. The Great Caledonian Valley. 41. Structure of Ben Nevis. 

 42. Retrospect. 43. Successive changes in the Organic Kingdoms. 44. 

 Geological effects of Dynamical and Chemical action. 45. Strata com- 

 posed of Organic Remains. 46. General Inferences. 47. The Ancient 

 World. 48. Corollary. 49. Final Effects. 50. Concluding remarks. 



7. Appendix 903—910 



A. — Count Strzelecki on the Volcano of Kirauea; p. 903. 



B. — On the Logan or Rocking-stones of Cornwall ; p. 904. 



C. — Rev. J. B. Reade on Fossil Infusoria; p. 905. 



D.— On the Parallel Terraces of Glen Roy; p. 906. 



E. — Sir John Herschel on the Variability of the Solar influence; p. 908. 



F. — Mr, Darwin on the Galapagos Islands ; p. 908. 



8. Description op Plate V 912 



9. VI 914 



10. Glossary 915 



11. Addenda 923 



12. Table of References in the Medals of Creation, corrected for the 



present Edition of the Wonders of Geology 925 



13. General Index 927 



