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1. Geology defined; 2. Oriental cosmogony; 3. Arabian writers of the tenth century; 4. Werner's application of geology to the art of mining; 5. Review of the causes which have retarded the progress of geology; 6. Proofs that the climate of the northern hemisphere was formerly hotter; 7. On the causes of vicissitudes in climate; 8. Geological proofs that the geographical features of the northern hemisphere were such as would give rise to an extremely hot climate; 9. Theory of the progressive development of organic life considered; 10. Division of the subject into changes of the organic and inorganic world; 11. Action of running water, continued; 12. Difference between the transporting power of springs and rivers; 13. Reproductive effects of running water; 14. Oceanic deltas; 15. Destroying and transporting effects of tides and currents; 16. Action of tides and currents, continued; 17. Reproductive effects of tides and currents; 18. Division of igneous agents into the volcano and the earthquake; 19. History of the volcanic eruptions in the district of Naples; 20. Dimensions and structure of the cone of Vesuvius; 21. External physiognomy of Etna; 22. Volcanic Archipelagos; 23. Earthquakes and their effects; 24. Earthquake in Calabria, February 5th, 1783; 25. Earthquakes of the eighteenth century, continued; 26. Magnitude of the subterranean changes produced by earthquakes at great depths below the surface.