576 
Host, 337. 
Huckleberries, 489. 
Hugo De Vries, 524, 524*. 
Hugo Von Mohl, 113. 
Humus, 154. 
Hybridization, 561. 
Hydrocyanic acid, 282. 
Hydrodictyon, 309. 
Hydrodictyon reticulatum, 309*. 
Hydrophytes, 504. 
Hydnum, 388, 387*. 
Hydrophytic socicties, 504. 
Hydrotropism, 151, 151*. 
Hygroscopic water, 153. 
Hymenium, 365. 
Hymenomycctes, 384. 
Hypha, 352; infection, 394. 
Hypocotyl, of Bean, 56, 56*, 106*; 
of Bean type of seedlings, 107; 
of Corn, 63; of Onion, 105*; of 
Red Clover, 109*; of Squash, 107, 
107*. 
Hypogynous flowers, 16, 15*, 484*. 
Impatiens, 88. 
Imperfect Fungi, 352; described, 404. 
Inbreeding, results, 564, 563*, 564° 
Incomplete flowers, 13, 11*, 12*. 
Indcterminate inflorescence, 28, 28%. 
Indian Turnip, 18, 18*. 
Indusium, 429, 430*. 
Infection hypha, 394. 
Inferior ovary, 15, 15*. 
Inflorescence, 26; determinate, 28, 
32*; indeterminate, 28, 32*. 
Inheritance, 517; described, 519; in 
ears of Corn, 551*; in heads of 
Wheat, 552*. 
Inorganic evolution, 513. 
Integument, 38, 35*, 36*, 38*, 39*; of 
Cycads, 448, 449*; of Pines, 454, 
455*. 
Interdependence of shoot and root, 
136. 
Internodes, 166; of Corn seedling, 
183*. 
Interrupted Fern, 431, 431*. 
Invertase, 285. 
INDEX 
Investigations since Mendel, 547. 
Involucre, 30, 29*. 
lodine test for starch, 256. 
Trish Moss, 326, 325*. 
Irish Potato, roots, 142; eyes and scale 
leaves, 181, 179*; propagation, 
226, 226%. 
Iron, a mineral clement for crops, 
157. 
Isoetes, 438. 
Isogametes, 302. 
Jcrusalem Artichoke, 181. 
Jimson Weed, 61. 
Johnson Grass, 177. 
Juglandaceac, 474. 
Jungermaniales, 407. 
Kafir Corn, 142. 
Keel, 24, 23*. 
Kelps, 319, 319*, 320*. 
Kxernel of Corn, 44*; structure, 62, 63, 
64*. 
Ixernel, of Oats, 22, 45*; of Wheat, 65, 
65*. 
Lactiferous vessels, 133. 
Lady’s Thumb, seeds, 75. 
Lamarck’s Eivening Primrose, 529. 
Lamarck, 515; his explanation of evo- 
lution, 515. 
Laminarias, 319. 
Lamb’s Quarter, sceds, 75*, 76*. 
Larches, 451. 
Large seeded Alfalfa Dodder, 76*. 
Lateral buds, 206, 206*.: 
Lateral flowers, 27. 
Law of Dominance, 543. 
Layering, 225, 231*. 
Leader, 312. 
Leaf Blight of Cotton, 404. 
Leaf buds, 207. 
Leaflet, 237, 237*, 238* 
Leaf traces, 185, 186*. 
Leaves, 233-286; auricles, 235, 236*; 
base, 235; blade, 235; cellular 
structure, 246-252; compound, 
237, 237*; development, 234; 
