630 
INDEX 
Homology, 28 
Hooke, Robert, 14 
Horehound, 479 
Hornbeam, 76, 77, 336 
Horsechestnut, 36, 120, 121 
Horsetails, 359, 368 . 
Hybridizing, artificial, 552 
Hygiene, personal, 311 
public, 311 
Hymenophyllum, 351 
Hypanthium, 464 
Hypocotyl, 381 
Hypothecium, 331 
I 
Ikeno, 404 
Imbibition, 58 
Incrustation, 578 
Indian pipe, 323, 339, 473, 476 
Indusium, 155 
Ingen-Housz, Jan, 73, 74 
Inheritance, alteration of, 566 
and environment, 560 
and reproduction, 544 
versus expression, 188, 543 
heredity, 544 
mechanism of, 565 
what is, 542 
Innovation-branches, 348 
Internode, 118 
Involucre, 483 
Isogametes, 251 
Isogamy, 352 
Isospores, 380 
Iva, 488 
J 
Jack-in-the-pulpit, 51 
Jeffrey, 426 
Job's tears, 446 
Johannsen, 561 
Johnson-grass, 496 
Juglans nigra, 308 
Jungermanniales, 210 
K 
Kalmia latifolia, 474 
Kingdom, organic, 8 
Kingdom, divisions of plant, 366 
Knight, Thomas Andrew, 128 
Knight's experiment, 127 
Knowlton, F. A., 595 
Kohlrabi, 464 
Kunze, 599 
Labiatae, 479 
Labium, 479 
Labor, division 01 physiological, 363 
Lagenostema Lomaxi, 596 
Lamarck, 506, 509 
Lamella, middle, 158 
Lang, ontogenetic hypothesis of, 
575 
Larch, 336 
Latex, 476 
L'athraea, 324 
Lathyrus latifolius, 466 
Layering, 179 
Leaf -base, 13 
Leaf-blade, internal anatomy of, 
3i,34 
types of, 30 
Leaf-fall, 101, 415 
Leaf-mosaic, 144 
Leaves, correlation among, 143 
growth of, 119 
lungs of plants, 103 
relation of, to light, 138 
spore-bearing, 154 
stomach of plants, 103 
Leeuwenhoek, 98 
Legume, 318, 468 
Leguminoseae, 466 
