xii ILLUSTRATIONS 



FIG. PAGE 



20. Glacier of the Blunilis Alp. (After Reclus) . . 228 



21. Cotopaxi. (After Judd) 237 



22. Lava Stream. (After Judd) 239 



23. Stromboli, viewed from the north-west, April 1874. 



(After Judd) 242 



24. Upper Valley of St. Gotthard 257 



25. Section of a river valley. The dotted line shows a 



slope or talus of debris 260 



26. Valley of the Rhone, with the waterfall of Sallenches, 



showing a talus of debris ..... 261 



27. Section across a valley. A, present river valley ; B, 



old river terrace 262 



28. Diagram of an Alpine valley, showing a river cone. 



Front view 263 



29. Diagram of an Alpine valley, showing a river cone. 



Lateral view 265 



30. Map of the Valais near Sion 266 



31. View in the Rhone Valley, showing a lateral cone . 267 



32. Do. showing the slope of a 

 river cone 268 



33. Shore of the Lake of Geneva, near Vevey . . . 269 



34. View in the district of the Broads, Norfolk . .271 



35. Delta of the Po 273 



36. Do. Mississippi 274 



37. Map of the Lake District 281 



38. Section of the Weald of Kent, a, , Upper Creta- 



ceous strata, chiefly Chalk, forming the North and 

 South Downs; 6, b, Escarpment of Lower Green- 

 sand, with a valley between it and the Chalk ; 

 c, c, Weald Clay, forming plains ; fZ, Hills formed 

 of Hastings Sand and Clay. The Chalk, etc., once 

 spread across the country, as shown in the dotted 

 lines 283 



39. Map of the Weald of Kent 284 



