ialp, and the
Maderanerthal. (After Heim) 221

20. Glacier of the Bluemlis 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, a_, Upper Cretaceous strata,
chiefly Chalk, forming the North and South Downs; _b, b_, Escarpment of
Lower Greensand, with a valley between it and the Chalk; _c, c_, Weald
Clay, forming plains; _d_, 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

40. Sketch Map of the Swiss Rivers 291

41. Diagram in illustration of mountain structure 296

42. Sketch Map of the Aar and its tributaries 299

43. River system round Chur, as it