INDEX 



References are to pages. 

 Mount Pelee 445 | Oxygen . 



Mountain passes 329 



Mountains 415-438 



climatic effects 429 



in history 437 



kinds of 



block 417 



folded ........ 418 



low (old) 422 



massive (new) 420 



peaks .' 424 



peneplains 424 



peoples 433 



products 428 



ranges 425 



Mulches .101 



Mushrooms 211 



Natural bridges 319 



pictures 317, 318 



Naval Observatories of the 



U. S 29 



Neb'ula, see Nebular Hypothesis. 



Neb'ular Hypd'thesis ... 6 



Nerves, system of 225 



of sight, hearing, etc. . . 230-232 



Newton, Sir Isaac (1642-1727), 



first law of 8 



law of gravitation 10 



theory of light 65 



Niagara Falls 331 



picture 332 



Nl'trogen, effect upon plants . 184 



in air Ill, 114, 178 



in soil 92, 212 



North star 3, 23 



Northern lights 129 



O'ases 258 



Oblate' sphe'roid 16 



Ocean, see the Sea. 



Oceanic Islands 260 



Oil 79 



Ooze 276 



Opos'sum 255 



Optic nerve 231 



Ore in mountains 428 



Osmo'sis 186 



O'vary of flower 201 



Oxbow lakes . . 338 



. . .73, 111, 114, 178 

 as plant food . 183, 196, 197, 208, 

 209, 239 

 for animals . . .217, 226-228, 233 



Pan'creas 234 



Parallels of latitude ... 32, 3;? 



Parasites 209 



picture (mistletoe) 210 



Pe'neplain 424 



Petroleum 79 



Pistils 201 



Pith rays 189 



Plains 391-407 



kinds of 



belted 393 



coastal 392, 394-399 



embayed . . 399 



flood 336 



lake 400 



life of 405-407 



river 401 



"the Great" 403-405 



Planetary winds 148 



Planetoids 6 



Planets, distance of .... 5, 6 



movements 3 



names 4,5 



Plants '. 182-212 



bacteria ........ 212 



diseases 210 



effect of glacial age upon . . 384 



flowers 200 



fungi, parasites, etc 209 



leaves 193 



of mountains 432 



protoplasm 186 



roots 183 



sap (osmosis) 186 



seeds 205 



stems 188 



Plateau 392,409-415 



buttes 412,413 



dissected 411 



mesas 412,413 



old 413 



Poles of the earth .... 3 



magnetic 35 



Pollen ,201 



Pompeii (pay'ee) 444 



