INDEX 



groups of algae, 371 



of fungi, 300 

 growth rings, 177 

 guard-cells, 235 

 gutta-percha, 3, 194 

 gymnosperms, 183, 260, 281, 



el seq. 



gyncecium, 274, 289 et seq. 

 gypsy moth, 197 



H 



haustoria, 384, 386 



hawk moth, 311, 312 



hawthorn, 155 



hay fever, 306 



hazel, 284, 308 



head, 297, 300 



heartwood, 177 



heat, 113 



heath family, 214 



hemlock, 431 



herbaceous, 145 



herbs, 146 



heredity, 135, 448 



hepatica, 274 



heterocyst, 364 



heterospory, 426 



Hibiscus, 289, 307 



hilum, 342, 353 



holly, 215 



hollyhock, 289 



homospory, 426 



honeybee, 311 



honey locust, 155 



hop tree, 63, 332 



horn wort, 228 



horny seeds, 347 



horse-chestnut, 188 



horsetails, 422 et seq. 



host, 374, 394 



humming birds, 313 



humus, 99, 379, 391 



Huxley, 32 



hyacinth, 57, 159 



hybrids, 305, 447 



hydrogen, 95 



Bydrophylhtm canadense, 296 



hydrotropism, 134 



hypha 1 , 379, 380 



hypocotyl, 342, 352, 353 



343, 431 



hypogean germination, 352 

 hypogyny, 291 



Impatient, 171, 321 



imperfect flowers, 281 



improvement of crops, 15 et seq., 103 et 



seq., 377 



indehiscent fruits, 330 

 indeterminate inflorescences, 299 et seq. 

 Indian pipe, 374 

 Indian turnip, 160, 279 

 indusium, 417, 418 

 inferior ovary, 292 

 inflorescence, 295 et seq. 

 inflorescence fruits, 333 

 inoculation of soil, 378 

 inorganic, 55 



insect pollination, 309 et seq. 

 insect traps, 25 2 et seq. 

 integument, 276, 443 

 intercellular spaces, 85 

 intergrades, 446 

 internodes, 50 

 involucre, 298 

 iodine, 233, 362, 372 

 Ipomea purpurea, 289 

 iris, 156 



iron, 95, 103, 232, 349 

 irregular corolla, 286 



Jack-in-the-pulpit, 160, 279 

 Japanese ivy, 213 

 Jerusalem artichoke, 159 

 jewel weed, 171 

 juniper, 308 



kelp, 372, 373 

 Krakatao, 355 



lady's slipper, 266 



lamb's quarters, 44 



Lamium, 321 



larkspur, 331 



late spring spore, 389, 390 



