ILLUSTRATIONS 
Coquina rock 
Sand beach, Cape Ain Maas 
Sandstone rock . 
Calcareous rock, Yellowstone Hake 
Silicious deposit, Yellowstone Park . 
Stalactites ina cave . 
Calcareous tufa . 
Fossil-bearing limestone rock 
Fossil-bearing limestone rock 
Piece of dried peat : 
Carbonaceous shale with plant fr pede 
An o6lite rock 
Enlarged section of odlite 
Geyserite, Yellowstone Park” 
Slate . 
Mica schist 
Gneiss 
Weathering of ‘anite : ‘ 
Weathering of rock of variable adueen ; 
Rock bearing lichens . 
Trees growing on rock 
Roots of upturned tree 
Decay of sandstone rock . 
Residual soil ; 
Diagram showing origin of residual soil 4 
Weathering on Pike’s Peak 
Forest covering in Adirondacks 
Absence of vegetation in arid lands . 
Talus slope in river valley 
Desert of Sahara 
Loess in China . 
Sand dunes, Cape Ann, Mass. 
Sand dunes, Bermuda Islands . 
Coral sand hills, Bermuda Islands 
Sand encroaching on forest 
Structure of blown sand : 
Sand action on cliffs in arid regions . 
Diagram showing origin of caverns . 
Map of channels in Mammoth Cave. 
Diagram illustrating destruction of caverns 
Stalactites, etc., Luray Cave . ‘ 
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