458 



INDEX 



groups of algae, 371 



of fungi, 3go 

 growth rings, 177 

 guard-cells, 235 

 gutta-percha, 3, 194 

 gymnosperms, 183, 



el seq. 

 gyncecium, 274, 289 

 gypsy moth, 197 



260, 281, 343, 431 

 et seq. 



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, 153 

 hop tree, 63, 332 

 hornwort, 228 

 horny seeds, 347 

 horse-chestnut, 188 

 horsetails, 422 el seq. 

 host, 374, 394 

 humming birds, 313 

 humus, 99, 379, 391 

 Huxley, 32 

 hyacinth, 57, 159 

 hybrids, 305, 447 

 hvdrogen, 95 



Eydrophyllum canadense, 2g6 

 hydrotropism, 134 

 hyphas, 379, 380 

 hypocotyl, 342, 352, 353 



hypogean germination, 352 

 hypogyny, 291 



Impatiens, 171, 321 



imperfect flowers, 281 



improvement of crops, 15 el 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, 252 et seq. 

 integument, 276, 443 

 intercellular spaces, 8s 

 intergrades, 446 

 internodes, 50 

 involucre, 298 

 iodine, 233, 362, 372 

 Ipomea purpurea, 289 

 iris, 136 



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 



