INDEX 



377 



Imbibition, 51 

 Immunity, 2SS 



Independent assortment, in inheri- 

 tance, 219 

 Indian Pipe, 173, 174 

 Indusium, 328, 331 

 Inflorescence, 193 

 Ingenhousz, 6 

 Inheritance, 206-225 



laws of, 209 



Mendel's law of, 211-223 



of acquired characters, 210 

 Insect-pollination, 194, 195 

 Insects, relation of, to flowers, 194 

 Insectivorous plants, 173 

 Integument, 197, 345, 346, 358 

 Interfasicular cambium, 104 

 Internode, 90 

 Intolerance, of shade, 161 

 Invasion of the land, 252 

 Invertase, 123 

 Iron, in formation of chloropliyll, 70 



importance of, 31, 168 

 7ns, rootstock of, 94 

 Irregular flower, 191 

 Irritability, of protoplasm, 155 

 Isoetes, 338, 339 

 Isogamy, 268 

 Isthmus, of desmids, 275 



Judas tree, living and fossil species 



of, 230 

 Jungermanniales, 317 



K 



Kalmia, flower of, 195 

 Kelps, 278 

 Kernel, of corn, 199 

 Kinetic energy, 69, 125 



Lady's Slipper, flower of, 366 

 Lamarck, theory of, 235 

 Laminaria, 278 



Land, difficulties of life on, 252 



invasion of, 252 



plants, charucteri.stics of, 253 

 Larksjjur, 89 



Lateral growing-point, 146 

 Laws of inheritance, 209, 211 

 Leaf, 19, 63-78, 325 



attachment of, 90 



blade of, 19, 63, 64, 65 



external structure of, 63, 64 



internal structure of, 65-69 



margin of, 64 



petiole of, 19, 63, 64 



simple and compound, 64 



stipules of, 63, 64 



venation of, 63, 65 

 Leaf-gap, 101, 329 

 Leaflets, 64 

 Leaf-trace, 101, 329 

 Leafy liverworts, 317 

 Leaves, arrangement of, 90 

 Lenticel, 92 

 Leucine, 122 

 Leucoplast, 120 

 Lichens, 175, 303, 304 



crustaceous, 303 



foliose, 303 



fruticose, 303 



symbiosis in, 303, 304 



synthesis of, 303 

 Life history of a fern, 332 

 Light, as environmental factor, 158 



as source of energy, 158 



as stimulus, 158 



in development of chloroj^hyH, 70 



infra-red, 71 



in photosj'ntliesis, 70 



toxic effect of, 159 



ultra-violet, 71 



wave-lengths of, 71 

 Lignified cell-wall, 100 

 Lilac, 90 

 Liliales, 366 

 Linaria, flower of, 191 

 Linden, leaf of, 63 

 Linnaeus, 5, 6, 260 

 Liquidamhar, twig of, 102 

 Liriodendron, twig of, 96, 97, 98 



