406 



FOUNDATIONS OF BOTANY 



Nucleus, 178. 



Nucleus of root-hair, *49. 



Nut, *222, 223. 



Nutrient substances, 168, 169, 171. 



Nutrition of plants, 165-176. 



Oak leaves, arrangement of, *140. 



Oat, root-system of, 48. 



Obovate, *131. 



Obtuse, *131. 



Odors of flowers, 357. 



Offensive-smelling plants, 352. 



Oil, 21, 22. 



Oil, essential, 24. 



Oil, extraction, 22. 



Oil, testing seeds for, 21, 22. 



Onion, bulb of, 77. 



Onion leaf, section of, *79. 



Onion, structure of, 116. 



Onion, tests for food-materials in, 



116, 117. 

 Oogonia, *251. 

 Oosphere, *249, *251, 280, *284, 



285. 



Oospore, 247, 249. 

 Opposite, *65, *140, *141, *142. 

 Orbicular, *131. 

 Orchid, aerial roots of an, *37. 

 Order, 230. 



Organs, essential, *197. 

 Organs, vegetative, 30. 

 Oscillatoria, study of, 239, 240. 

 Osmosis, 50-64. 

 Osmosis in an egg, 50, *51. 

 Osmosis in root-hairs, 53, 54. 

 Ovary, 201, 202, *203, *205. 

 Ovate, *131. 

 Ovoid, egg-shaped. 

 Ovule, 202, *203. 

 Ovule, spruce, fertilized, *303. 

 Ovule, structure of, *215. 



Oxalis leaf, development of, *127. 

 Oxidation, 11, 12. 

 Oxygen, 11, 12, 166, 167, 168. 

 Oxygen-making, 167, 168. 



Palisade-cells, *151. 



Palmate, *133. 



Pampas region, 393. 



Panicle, *189, 190. 



Panicum, *381. 



Pansy, leaf-like stipules of, *135. 



Papilionaceous corolla, *199. 



Papillae on stigma of a lily, *214. 



Paraphyses, 251, *252. 



Parasites, 39, 336-338. 



Parasitic roots, 39, *40. 



Parenchyma, 94. 



Parietal placenta, 203, *205. 



Parsnip root, study of, 45, 46. 



Pea seed, 8. 



Pea seedling, mutilated, 14. 



Pea seedling on clinostat, 58. 



Peat bogs, 327. 



Peat moss, *327. 



Pedicel, *186, 187. 



Peduncle, *186, 187. 



Peg of squash seedling, 27. 



Pepo, 224. 



Perennial, 47, 71. 



Perfect, 198. 



Perianth, *197. 



Pericarp, 224. 



Perigynous, 204, *205. 



Perithecia, 263. 



Permanganate test, 28. 



Petal, 197. 



Petiole, 130, 134. 



Phseophyceae, 232. 



Phanerogams, 231, 233. 



Phanerogams, classes of, 233. 



Phosphorus, 165. 



