INDEX. 



269 



Grafting, 63, 64. 



Grain, 186. 



Gray, Asa, 44. 



Gourd-cell, 65. 



Grape sugar, test for, 75, 76. 



Green layer of bark, 52, 60. 



Groups, natural, 216. 



Growth, measurement of, in stem, 



15, 10. 

 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, 50. 



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. 

 Hyphae, 231. 

 Hypogynous, 149. 



Imperfect flowers, 145. 



Increase, rate of, 199, 200, 204, 



205. 

 Indefinite annual growth, 43. 

 Indehiscent fruits, 186-189. 

 Indeterminate inflorescence, 131. 

 Indian corn, germination of, 20. 

 Indian com, 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, 109-1 1 1 . 

 Internode, 15, 39. 

 Involucre, 133. 

 Iodine a starch-test, 21, 22. 

 Ipomoea, rate of increase of, 199, 



200. 

 Iris, flowers and fruit, 181. 

 Iris, 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. 



