276 
Herbs, 54. 
Hesperidium, 181, 182, #188. 
Hilum, *5. 
Honey-bee, leg of, #170. 
Hop, twining of, *57. 
Horse-chestnut bud, study of, 86, 
87. 
ITorse-chestnut twig, 49, 50. 
Host, 32, *33. 
Hot springs, plants in, 204. 
Hyacinth, bulb of, *60. 
Hybrid, 208. 
Hybridization, 208. 
Hydrangea, transpiration in, *133, 
134. 
Hydrogen, 138. 
Hydrophytes, 114, #115. 
Hymenium, #229, #230. 
Hyphe, 222, *223. 
Hypocotyl, *5, #23, #71. 
Hypocotyl, cross-section of, #71. 
Hypogynous, 155, *156. 
Imperfect flowers, 150, *151. 
Indefinite annual growth, 54. 
Indehiscent fruits, 185, *186. 
Indeterminate inflorescence, App., 
269. 
Tndian corn, germination of, 6, 7. 
Indian corn, kernel of, *14. 
Indian corn, root-tip, *36. 
Indian corn, structure of stem, *65, 
66. 
Indian pipe, 139. 
Indusium, #244, 245, #259, 
Inflorescence, App., #268, 269. 
Inflorescence, diagrams of, #268. 
Insectivorous plants, 119-122*. 
Insect pollination, 169-180*. 
Insect pollination, study of, 180. 
ELEMENTS 
OF BOTANY 
Insects, pollen-carrying apparatus 
of, 169, *170. 
Insects, sense of smell of, 170, 171. 
Insects, vision of, 171. 
Insect-traps, leaves as, 119-122*. 
Insect visits, #172, #173. 
Insertion of floral organs, *156. 
Internode, 26, 65. 
Involucre, App., *267, 269. 
Ipomea Jalapa, 38. 
Ipomaa, rate of increase of, 201, 
202. 
Trritability in plants, nature and 
occurrence of, 45. 
Ivy, aérial roots of, 30, #31. 
Keel, #150. 
Kidney-shaped, App., *268. 
Labiate, #152. 
Ladyfern, 243. 
Lanceolate, App., #263. 
Lateral buds, 50, #88, #89, 
Leaf, 97-142*. 
Leaf, accumulation 
matter in, 135. 
Leaf-arrangement, 105-108*. 
Leaf-bases, App., *264. 
Leaf-buds, *89, *90. 
Leaf, fall of, 141, 142. 
Leaf-like stems, 61, *62, 63. 
Leaf-margins, App., *265. 
Leaf-mosaic, 106, *107. 
Leaf-outlines, App., #263. 
Leaf-sections, 127, *128. 
Leaf-spine, *128, 124. 
Leaf-stalk, *98. 
Leaf-tendril, *103. 
Leaf-tips, App., *264. 
Leaf-traces, 79, 130. 
of mineral 
