492 



glossakiaij index. 



Nigi-osin, 19, 380. 



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

 test foi-, 326, n. 



Nitric acid (HNOa), 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, »., 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 cellulfe, 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 (yt$ [gen. vuktos], 

 night; Tpdiros, a turn), 409. 



Oaks, histological classification of, 

 143, ).. 



Objectives, 2. 



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



Oil in seeds, 331. 



Oil of cloves, 3, 23. 



Oleic acid (CieHsiO,), 360. 



Oleiu (C„H,„40„), 360. 



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

 toplasmic movements, 211. 



Oophytes, reproduction in, 440, n. 



Oosphere (uov, an egg; o''<>aipa, a sphere), 

 435, 440, ?.., 441, n. 



Oospore {ioy, au egg; o-Trdpos, seed), 436, 

 440, n. 



Open bundles, 104. 



Opening and closing of flowers, 412. 



Orange "K," 19. 



Orchids, trachi Ms in roots of, 109. 



Organ, 102, ISO; rank of an, 186, w. 



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) (OsOj), 14, 

 46. 



Osmometer (ua/ids, impulse ; iierpov, mea-. 

 sui-e), 224. 



Osmosis (u(riu.ds, impulse), 221, 224. 



Osmotic equivalent, 225. 



Osmundacese, stems of, 154. 



Ovary {ovum, an egg), arrangement of 

 fibro-vascular bundles in au inferior, 

 174; arrangement of fibro-vascular 

 bundles in a superior, 173; structure 

 of the, 172; varieties of conductive 

 placeiitie in an, 432. 



Ovules, changes iu the fertilization of, 

 435; development of, 433; formation 

 of, 175 ; ripening of, 178 ; structure of 

 the, in angiosperms, 432 ; structure of 

 the, in gymnosperms, 438. 



Ozone, 304. 



Oxalates, test for, 9, 54. 



Oxalic acid (CjHA), 360. 



Oxidation, 355. 



Oxygen, an agent in the disintegration 

 of rocks, 237 ; amount of, absorbed 

 during respiration, 368; ainount 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. 



Palisade-cei.ls, 61, 159. 



Pahnate venation in leaves (palmatus, 

 bearing the mark of a hand), 157. 



Palmatin (CiiHrnOc), 360. 



Palmitic aciil (CoHsjOi), 360. 



Palms, fibro-vascular bundles in, 130, 

 131. 



Paper-pulp, inanufacture of, 145. 



Paracellulose, 35. 



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



Parallel venation in leaves, 156. 



Parasites (n-apatriTo?, one who lives at 

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

 phyll lacking in certain, 204; food of, 

 338; roots of, 116; union between, and 

 their hosLs, 153, 338. 



Parchment paper, 32, n. use of, in 

 making osmometer, 224. 



Parenchyma (iropeyi^^eio, I pour in beside), 



