INDEX. 
Grafting, 63, 64. 
Grain, 186. 
Gray, Asa, 44. 
Gourd-cell, 55. 
Grape sugar, test for, 75, 76. 
Green layer of bark, 52, 60. 
Groups, natural, 216. 
Growth, measurement of, in stem, 
15, 16. 
Growth, secondary, 62, 63. 
Guard-cells, 114. 
Gymnosperms, 216. 
Hairs, 113, 209. 
Halberd-shaped, 86. 
Hastate, 86. 
Haustoria, 28. 
Head, 133. 
Heart-shaped, 86. 
Heartwood, 59. 
Herb, 43. 
Herbaceous, herb-like, 
Hesperidium, 182, 194. 
Hilum, 4. 
Honey-bee, leg of, 162. 
Honey-gland, 163. 
Horse-chestnut bud, study of, 77, 
78. 
Horse-chestnut leaf, 95. 
Horse-chestnut twig, 38. 
Host, 28, 29. 
Hot springs, plants in, 204. 
Hybrid, 214. 
Hydrangea, transpiration in, 114- 
116. 
Hydrogen, 119. 
Hyphe, 231. 
Hypogynous, 149. 
Imperfect flowers, 145. 
269 
Increase, rate of, 199, 200, 204, 
205. 
Indefinite annual growth, 43. 
Indehiscent fruits, 186-189. 
Indeterminate inflorescence, 131, 
Indian corn, germination of, 20. 
Indian corn, structure of stem, 64, 
65. 
Indian pipe, 120, 121. 
India-rubber plant, transpiration 
in, 114-116. 
Indusium, 241. 
Inflorescence, 131-136. 
Inflorescence, diagrams of, 135. 
Insect fertilization, 161-175. 
Insect fertilization, studies in, 173- 
175. 
Insectivorous plants, 104-107. 
Insects, pollen-carrying apparatus 
of, 162. 
Insect-traps, leaves as, 104-107. 
Intercellular spaces, 109-111. 
Internode, 15, 39. 
Involucre, 133. 
Iodine a starch-test, 21, 22. 
Ipomeea, rate of increase of, 199, 
200. 
Tris, flowers and fruit, 181. 
Tris, rootstock of, 48. 
Iron, 122. 
Ivy, aerial roots of, 26. 
Kidney-shaped, 85. 
Labiate, 148. 
Lady-fern, 241. 
Lanceolate, 85. 
Leaf, 85-125. 
Leaf, accumulation of mineral 
matter in, 117. 
