INDEX 



References are to pages. 



Delta Continued 



of the Mississippi, pictures 352, 356 



Desert, adaptability to ... 245 



irrigation 102 



life 258 



oases 258 



pictures 258, 259 



reflectors used in 63 



sandstorms ....... 258 



Dew 126 



Diameter of the earth . . 16 



Diaphragm 227 



Di'atoms 249 



Di'cotyle'dons .... 190, 207 



Directions 23 



Disinfectants 215 



Divides 328 



Dol'drums 149 



Draft (of a stove) 116 



Drainage', basins of U. S. . . 354 



effected by glaciers .... 380 



of level areas 391 



See also Rivers. 



Drum'lins 376 



picture 375 



Dry farming 101 



Dunes, sand 302, 387 



Ear, parts of 231 



picture 231 



Earth, ancient ideas of ... 3, 22 



as planet 3-6 



axis and poles 3 



inclination of axis .... 25-28 



interior 21 



land and water 68-70 



land surfaces 70 



magnetic fields 34-43 



man and 19, 20 



" oblate spheroid " . . . . 16 

 revolution around the sun . 23-30 



rotation 22 



satellite 11 



shape and diameter .... 16 



size 18 



surface 16,68 



water 71 



Earthquakes 425-428 



Electric doorbell 165 



Electricity, 



cells 165 



conductors 161 



lightning 162 



telegraph 165-167 



thunder-storms 163 



two kinds 161 



Electro-magnets 39 



use in telegraphy 165 



Ellipse' 24 



Energy, conservation of . . 46, 47 



from food 236 



in animals 217 



in plants 198, 208, 209 



of the sun 15, 45-67 



potential and kinetic . . . 45, 46 



Epiglot'tis 226 



Equator 25 



heat equator 148 



Equinox, autumnal and vernal 28 



Erosion, by water 326 



of Colorado River 410 



of Mt. Taylor volcano ... 448 



of rivers 333 



of winds 386 



on " Great Plains " .... 404 



Esker 377 



picture 376 



Estuaries 305 



Evaporation from the sea . 289 

 Extension of matter ... 7 



Eye, like camera 58 



parts of. 230 



picture 231 



Eyelid 230 



Fahrenheit, Gabriel (1686- 



1736) 51 



Fallline 397 



Falls 329-332, 398 



of Niagara .332 



ofYosemite 330 



Fans 349 



picture 348 



Fats as food 235 



Faults 415 



See also Mountains. 



Fauna 247 



of the U. S 247 



Ferrel's Law 148 



