492 



GLOSSABJAL INDEX. 



Nigrosin, 19, 380. 



Nitrates, as a source of plant-food, 335; 

 test for, 326, n. 



Nitric acid (HNO), 13; as a source of 

 plant-food, 335. 



Nitrogen, amount of, in plants, 327; 

 amount of, in rain-water, 331 ; appro- 

 priation of, by plants, 325, 330 ; com- 

 parative needs of wild and cultivated 

 plants for, 334 ; compounds of, in the 

 atmosphere, 331: in coloring-matters 

 of leaves, 292; in the soil, 333; mode 

 of formation of atmospheric com- 

 pounds of, 332 ; sources of, for plants, 

 327. 



Non-sexual reproduction, 426, 444. 



Nucellus, 175, 182, 433. 



Nuclear disc, 376. 



Nuclear spindle, 376. 



Nuclein, 375, 376, 378. 



Nucleus, 25, n., 28, 199, 220, 374; be- 

 havior of the, with reagents, 375; dem- 

 onstration of changes in the, in the 

 development of pollen-grains, 380; 

 structure of the, 375. 



Nucleus cellulas, 27, n. See Nucleus. 



Nucleus of a starch-granule. See Hilum. 



Nucleus of the ovule. See Nucellus. 



Nucleolus, 28, 375. 



Nutation (nutatio, a nodding), 400. 



Nutrition, 355. 



Nyctitropic movements ('f [gen. 

 night; rpoiros, a turn), 409. 



OAKS, histological classification of, 

 143, n. 



Objectives, 2. 



Odors, of flowers, 454; of wood, 142. 



Oil in seeds, 361. 



Oil of cloves. 3, 23. 



Oleic acid (C.jH^O,), 360. 



Olein (C^H^O,,), 360. 



Olive-oil, use of, in experiments on pro- 

 toplasmic movements, 211. 



OSphytes, reproduction in, 440, . 



Oosphere (<*>", an egg; r^alpo, a sphere), 

 435, 440, n., 441, n. 



Oospore (Mv, an egg; <nn>po, seed), 436, 

 440, n. 



Open bundles, 104. 



Opening and closing of flowers, 412. 



Orange "R," 19. 



Orchids, trachelds in roots of, 109. 



Organ, 102, 186; rank of an, 186, n. 



Organic acids, effect of, upon turges- 

 cence, 414. 



Organic matter, appropriation of, by 

 the plant, 337; changes of, in the 

 plant, 354. 



Organic products, classification of, 

 357. 



Osmic acid (perosmic acid) (OsO 4 ), 14, 

 46. 



Osmometer (u7/xd, impulse; ^trpov, mea- 

 sure), 224. 



Osmosis (uo>i6f, impulse), 221, 224. 



Osmotic equivalent, 225. 



Osmundacea?, stems of, 154. 



Ovary (ovum, an egg), arrangement of 

 fibro-vascular bundles in an inferior, 

 174; arrangement of fibro-vascular 

 bundles in a superior, 173; structure 

 of the, 172; varieties of conductive 

 placentae in an, 432. 



Ovules, changes in the fertilization of, 

 435; development of, 433; formation 

 of, 175; ripening of, 178; structure of 

 the, in angiosperms, 432 ; structure of 

 the, in gymnospenns, 438. 



Ozone, 304. 



Oxalates, test for, 9, 54. 



Oxalic acid (CjH.O*), 360. 



Oxidation, 355. 



Oxygen, an agent in the disintegration 

 of rocks, 237; amount of, absorbed 

 during respiration, 368; amount of, 

 evolved in assimilation, 319; necessary 

 for germination, 464; necessary for 

 protoplasmic movements, 210; of air 

 ample for respiration, 368; relations 

 of growth to, 388; required bv roots, 

 245. 



PALISADK-CEI.LS, 61, 159. 



Palmate venation in leaves (pnlmatw, 

 bearing the mark of a hand), 157. 



Palmatin (CnHagOr,), 360. 



Palmitic acid (C I9 H W O>), 360. 



Palms, fibro-vascular bundles in, 130, 

 131. 



Paper-pulp, manufacture of, 146. 



Paracellulose, 35. 



Paraffin, use of, in section-cutting, 3. 



Parallel venation in leaves, 156. 



Parasites (ropo<riTo?, one who lives at 

 another's expense), 289, 338; chloro- 

 phyll lacking in certain. 294; food of, 

 338; roots of, 116; union between, and 

 their hosts, 153, 338. 



Parchment paper, 32, n. use of, in 

 making osmometer. 224. 



Parenchyma (wa^tyx***- 1 p ur > n beside). 



