INDEX 



References are to pages. 



Igneous rocks 77 



See also Rocks. 

 Incompressibility of air . . 73 



Inertia 8, 9, 10, 14 



Inlet 303 



Insolation (sun radiation) . . 130 

 Intensity of light 61 



See Light. 

 International Date Line . . 30 



map 30 



Intestines 234 



picture 233 



Inver'tebrates .... 218-224 



insects 221 



protozoa ........ 218 



_ worms '. . 220 



I'ris of the eye 230 



sketch of 231 



Irrigation 102 



in squares and furrows . ' 102, 103 

 Islands, atolls .... 289, 307 



coral 289 



_ life on 260 



I'sobars 138 



_ maps of 140, 141 



I'sogonic lines 35, 36 



I'sotherms 135 



maps of 136, 137 



Japan Current 282 



map 280 



Jellyfish 249 



Joule, James P. (1818-1889) . 48 



Jupiter, the planet 4, 5 



Kangaroo 255 



Kinet'ic energy 45 



in plants 209 



See also Energy. 



Labrador Current .... 282 

 map 280 



Lagoons' 289, 302 



Lakes 322-325 



Ag'assiz 381-382 



glacial 380 



salt 325 



Land of the globe .... 68 

 changing beaches . . . . 68, 69 

 characteristics 70, 71 



Land of the globe Continued 



life 251, 2o4 



rock structure 79, 81 



soil 85-105 



subsoil 87 



weathering 82-84 



La'tent energy, see Potential 

 Energy. . 



Lateral moraine 367 



Latitude .... 25, 26, 32, 33 



determination of (appendix) . 455 



La'va . . . 441,442,445,447,451 



pictures 450, 452 



Leaves of plants . . . 193-200 



Levees' 339 



Life, adaptability of . ... 245 

 affected by geographical isola- 

 tion 256, 260 



by climate 256 



by man 261 



by the desert 258 



distribution 243 



of islands 260 



of mountains 433 



of the land 251 



of the sea 248 



Light 47,57-66 



atmospheric phenomena, rain- 

 bow, coronas, halos . . . 128 



aurora borealis 129 



intensity 61 



mirage 129 



properties of 58 



reflection 58, 59, 62-64 



refraction 60 



spectrum 127 



speed 64 



theory of 65 



Lightning 162-164 



Lightning rods 163 



Lime, limestone .... 85-105 

 See Soils. 



Liver 234 



Loadstone 34-42 



See Magnetism. 

 Loam .......... 88 



See Soils. 



Loess beds (lo'es) 386 



Longitude 33, 34 



Lungs. 226, 



