272 INDEX. 



I 



Isomeric bodies, ..... 58 



India rubber, . . . . .62 



Indigo, . . . . . . 64 



Inorganic elements of plants, . . .65 



Iodine, ...... 66 



Idial section of the earth's crust, . . .79 



Integument, . . . . . 101 



Inflorescence, . . . . .118 



Inflorescence, centripetal . . . . 119 



Inflorescence, centrifugal . . . .119 



Isothermal lines, . . . . . 127 



Isochimenal lines, ..... 127 



Ignis fatuus, . . . . . 147 



Iron, ....... 159 



Irrigation, . . . . . 179 



Inclined plane, . . . . .234 



j 



Joint, - 75 



K 



Kaolin, . - 167 



L 



Light, - 32 



Light, nature of - 32 



Light, reflection and refraction of 32 



Light, origin of - - 33 



Light, heating rays of 33 



Lignine, 58 



Lava, - 84 



Limestone, primary 86 



Latex, - .... 108 



Liber, - 108 



Leaf, - - - 111 



Leaves, deciduous - 111 



Leaves, evergreen - 111 



Leaves, scattered - 111 



Leaves, alternate - 111 



Leaves, opposite - 111 



