372 
Germination, conditions of, 7-9. 
Gill fungi, 259-262*. 
Gills, *260, *261. 
Gipsy moth, 350, 351. 
Gourd-fruit, 188. 
Grafting, *75. 
Grain, 186, 324, 325. 
Grape hybrids, 319. 
Grape sugar, 85. 
Grapes, 330. 
Gray, Asa, 55. 
Green alg, 225-230*. 
Green layer of bark, 69. 
Growing point, 6, *36. 
Growth, secondary, 71, *72, *73, 74. 
Guard-cells, #128, #129, 132. 
Gymnosperms, 153, 211. 
Hairs, 132. 
Hairs, stinging, 124, 125, *126. 
Halberd-shaped, App. I, #356. 
Halophytes, 114, 118. 
Hard bast, *68, *69, *70, #73. 
Hard woods, 344-348*, 
Haustoria, 32, *33. 
Hay, 336. 
Head, App. I, *358. . 
. Heart-shaped, App. I, *856. 
Heartwood, 74, 77. 
Heliotropism, 111, 112. 
Herbs, 54. 
Hesperidium, 181, 182, *188. 
Heterospory, 293. 
Hilum, *5. 
Honey-bee, leg of, *170. 
Hop, twining of, *57. 
Horse-chestnut bud, study of, 86, 
87. 
Horse-chestnut twig, 49, 50. 
Horsetails, 287-291*, 
ESSENTIALS OF BOTANY 
Host, 32, *33. 
Hot springs, plants in, 204. 
Hyacinth, bulb of, *60. 
Hybrid, 316. 
Hybridization, 316. 
Hybridizing, 316-323. 
Hydrangea, transpiration in, *133, 
134. 
Hydrogen, 138. 
Hydrophytes, 114, *115. 
Hymenium, *261, *262. 
Hyphae, *247, *249, #251, *256. 
Hypocotyl, *5, *23, *71. 
Hypocotyl, cross-section of, *71. 
Hypogynous, 155, *156. 
Imperfect flowers, *149. 
Indefinite annual growth, 54. 
Indehiscent fruits, 185, *186. 
Indeterminate inflorescence, App. 
I, 361. 
Indian corn, germination of, 6, 7. 
Indian corn, hybridizing, 317. 
Indian corn, kernel of, *14. 
Indian corn, root-tip, *36. 
Indian corn, structure of stem, *65, 
66. 
Indian pipe, 139. 
Indusium, *281. 
Inflorescence, App. I, 358-361*. 
Inflorescence, diagrams of, App. I, 
*360. 
Insect pollination, 169-180*, ° 
Insect pollination, study of, 180. 
Insect visits, #172, *173. 
Insect-traps, leaves as, 119-122*, 
Insectivorous plants, 119-122*. 
Insects, pollen-carrying apparatus 
of, 169, *170. 
Insects, sense of smell of, 170, 171. 
