INDEX. 
Mycelium, 231. 
Myrsiphyllum, 50, 51. 
Naked buds, 79. 
Nasturtium leaves, starch in, 121. 
Natural selection, 212. 
Nectar, 162, 163. 
Nectar-glands, 163. 
Nectar-guides, 164. 
Nectaries, 163. 
Netted-veined, 87, 88. 
Nitric acid, test for proteids, 24. 
Nitrogen, 122. 
Nocturnal position, 98, 99. 
Node, 15, 39. 
Nourishment, storage of, 17-25. 
Nucleus, 128. 
Nut, 186. 
Nutrient substances, 122. 
Nutrition of plants, 119-123. 
Oak, leaf-arrangement of, 94. 
Oak wood, 53. 
Oat, germination of, 21. 
Obovate, 86. 
Obtuse, 86. 
Odors of flowers, 163. 
Oil, 24. 
Oil, testing seeds for, 24. 
Onion, structure of, 74. 
_ Onion, tests of for food-materials, 
75, 76. 
Odsphere, 226. 
Opposite, 40. 
Orbicular, 85. 
Order, 214, 215. 
Osmose, 35-37, 71. 
Ovary, 146. 
Ovate, 85. 
Ovule, 157-159. 
271 
Ovule, structure of, 159. 
Oxidation, 9. 
Oxygen, 118. 
Oxygen-making, 118. 
Palisade cells, 108. 
Palmate, 88. 
Pampas region, 205. 
Panicle, 134. 
Panicum, 201. 
Papilionaceous corolla, one which is 
more or less like a butterfly in 
shape, Fig. 119. 
Parallel-veined, 90, 91. 
Parasite, 28. 
Parasitic roots, 28, 
Parenchyma, 58. 
Parietal placenta, 148. 
Parsnip root, study of, 32. 
Pea, 4, 6, 8, 10, 18. 
Pear, flowers and fruit, 178. 
Pedicel, 132. 
Peduncle, 132. 
Pepo, 193, 194. 
Perennial, 33, 34. 
Perfect, 148. 
Perianth, 139. 
Pericarp, 193. 
Perigynous, 149. 
Petal, 137. 
Petiole, 86. 
Phanerogamous, 216. 
Phanerogamous groups, 216. 
Phosphorus, 122. 
Physiology, vegetable, 2. 
Pigeon-wheat moss, study of, 255- 
239. 
Pine, seedling, 17. 
Pine wood, 60. 
Pinnate, 87, 89. 
