ILLUSTRATIONS XVli 



PAGE 



Stratified Rock 80 



Folded Rocks 81 



Rocks weathering and forming Deep Slopes ..... 82 



Cleopatra's Needle, Central Park, New York 83 



Rocks split by Roots of a Tree ....... 84 



Wind-cut Rocks 84 



Local Soil ,85 



Digging Peat in Ireland 86 



Molehills .90 



Anthill 91 



Mud Cracks ' .... 92 



Lumpy Soil 93 



Adobe Soil 94 



The Cracking of Adobe Soil when Dry 95 



Prairie Scene 95 



Alfalfa Root . . 96 



A Natural Spring 98 



An Artesian Spring 99 



"Dry Farming" in Egypt . . . . . . . .100 



Kaffir Corn 101 



Irrigation in Squares . . . . . . . . .102 



Irrigation in Furrows . . . . . . . . .103 



Alkali Soil 104 



Reclaiming Alkali Soil in the Sahara . . . . . . 104 



Roman Plowing .... . . . . . - . 105 



Steam Plow . . . . ". . . . . 105 



Good Soil ' .-. "'.'.". * . . . . . . 106 



Blue Hill Observatory, Milton, Mass. . . . . . . 110 



Balloon . . . . . . v . , - .' v . . . 115 



Hot Air Furnace ., . . . .... .... 117 



Barograph . . . . . . . ,, . . . . . 121 



Cumulus Clouds . . . . . / _. .' '. . V. 126 



Fog V ', *J . . 127 



Lick Observatory - . .. . .128 



A Winter Scene in Venice . : . . . . ; . ' . 133 



A Winter Scene in Montreal 134 



A Dutch Windmill 145 



Effect of Wind on the Growth of Trees 146 



A Sailing Vessel 147 



Wind Belts of the Earth . . . 149 



Salmon River Dam, Idaho 157 



East End of the. Assuan Dam across the Nile . 159 



