LIST OF ILLUSTRATIONS

Fig.		PAGE
1	Surface of Limestone plateau, Causse du Larzac, Aveyron	45
2	Ravine in Limestone, Cañon of the Dourbie, Aveyron	47
3	Waterworn cliff of Limestone, Millersdale	49
4	Limestone country dissected by ravines, Hercegovina	51
5	Sand developing from Sandstone, Cape of Good Hope	59
6	Siliceous Conglomerate, Co. Waterford	75
7	Quartzite Cone, Croagh Patrick	77
8	Shrinkage-cracks in Clay, Spitsbergen	81
9	Landslide of Limestone over Shale, Drôme	93
10	Weathering of Shale, Isère	95
11	Boulder-clay, Crich, Derbyshire (Phot. H. A. Bemrose)	97
12	Nordenskiöld Glacier, Spitsbergen	99
13	Sefström Glacier, Spitsbergen	101
14	Ash-layer of 1906 on Vesuvius	111
15	Puy de la Vache, Puy-de-Dôme	113
16	Granite invading Mica-schist, Cape Town	121
17	Weathering granite, Lundy Island	139
18	Granite weathering under tropical conditions, Matopo Hills	141
19	Composite Gneiss, Co. Donegal	153
20	Composite Gneiss, Ängnö, Sweden	155

(Figs. 11 and 17 are reproduced from the Cambridge County Geographies of Derbyshire and Devonshire respectively; the rest of the illustrations are from photographs by the author.)