xvi LIST OF ILLUSTRATIONS. 



KIG. I'AGE 



24. Daily Telegraph barometer chart 97 



25. Decomposition of water by electricity loi 



26. Oxygen and hydrogen from decomposiuou of water . . . 103 



27. Decomposition of water by means of sodium 107 



28. Decomposition of water by means of heated iron .... 108 



29. Formation of water by combustion of dry liydrogen . . . 112 



30. Bridge of travertine at Clermont, Auvergne 121 



31. Stalactites and stalagmites, Isle of Cally 123 



32. The Grand Cafion, Colorado 137 



ITj. Self-establislied drainage system 138 



34. River-valley worn through gravel and London clay .... 139 



35. Delta of the Nile 144 



36. Catchment-basin and delta of a rivur 145 



37. Delta of the Missis.sippi 146 



38. Hope's experiment on the contraction of water 152 



39. Glacier of Zermatt 156 



40. Motion of a glacier 157 



41. Lateral and medial moraines 160 



42. Roches Moutonnees Creek, Colorado 162 



43. The Needles, Isle of Wight 169 



44. Map of the Atlantic, showing course of the Gulf Stream . . 174 



45. Section of the Atlantic Ocean between Sandy Hook (near 



New York) and Bermuda, a distance of 700 nautical mile=. 175 



46. Currents in water by heat 1 77 



47. Currents in water by cold 177 



48. Chart of the estuary of the Thames between the Nore an^l 



Margate . 182 



49. Plain of marine denudation 183 



50. Diagrammatic Section of a Volcano 190 



51. Diagrammatic Section of a Cinder Cone igi 



52. Breached Volcanic Cones, Auvergne 194 



53. Diagi-ammatic Section of Volcano, with Dykes and INTinor 



Cones 194 



54. Summit of Vesuvius in 1756 195 



55. Summit of Vesuvius in 1 767 .• 196 



56. Vesuvius and Monte Somma 198 



