510 



INDEX. 



Nuclear division ; multinuclear cells, 

 230, 247 (fig. 95). 



permanent preparations, 444 et seq. 



- plate, 435, 439 (fig. 154). 



spindle, 439. 



Nuclei, union of, in asci, 329. 



Nucleolus, 40, 253, 260, 305. 



Nucleus, 28 ; of Cladophora glomerata, 

 247 (fig. 95); of Cucurbita, 47; 

 Penicillium crustaceum, 324 ; Pin- 

 nularia, 257 (fig. 97) ; Protococcus, 

 260 (fig. 98) ; Saccharomyces 

 (yeast), 288; Spirogyra, 252 (fig. 

 96) ; staminal hairs of Trades- 

 cantia, 39 (fig. 14), 435 (fig. 153) ; 

 pollen-grains of Tradescantia, 286 

 (fig. 141) ; old nodes of Trades- 

 cantia, 456 (fig. 160) ; absence from 

 Schizophyta, 262. 



See also multinuclear cells. 



relations to fertilisation, oo-nucleus, 



spermo-nucleus, reproductive or 

 generative nucleus, 305, 375, 386. 



staining, 28. See also nuclear 



division. 



structure in resting state, 435 (fig. 



153, 1). 



Nucule, of Chara, 306. 



Nutation of Oscillaria, 263. 



Nutrient solution. See culture- 

 methods. 



OAK-APPLE, oak-gall, tannin in, 70. | 



Oak (Querciis), autumn tints of, 58. 



Oat. See A vena sativa. 



Object-glass, objective, qualifications 

 of good, xxiii ; for homogeneous im- 

 mersion, xxv ; for water immer- 

 sion, xxv ; to clean, xxvi, 14, 20. 



apochromatic, xxvi. 



correction collar for, xxv. 



slides (micro-slides), xxix; hollowed, 



279. 



Ocular. See eye-piece. 

 (Enothera biennis, pollen-grains of, 



386, 387 ; ovary, 397. 

 Oil, action of alkanet on, 88. 



action of sulphuric acid on, 88. 



- bodies of liverworts, 234. 



drops, optical appearance of, 33. 



ethereal, 34, 189. 



fat and etherial, to distinguish, 



34. 



- glands of Ruta, 189 (figs. 75, 76) ; 



Citrus, 427. 



in Bicinus (castor oil), 33 ; in 

 1 thallus of Fucus, 242. 



olive, use of, 33 ; Origanum, use of, 



365. See also cloves, cedar. 

 Olive oil, use of, 33, 52. 

 Onion. See Allium Cepa. 



Oogonium of Chara, 306, 309 (fig. 113) ; 

 Fucus, 300; of Pythium, 322; 

 Vaucheria, 297 (fig. 110). 



Oo-nucleus, 305, 375, 403. 



Oosphere, of Aconitum, 399 (fig. 145) ; 

 Chara, 309 ; Fucus, 300 (fig. Ill) ; 

 Marchantia, 342 (fig. 124) ; Mnium, 

 347; Picea, 374 (fig. 136); Poly- 

 podium, 360 (fig. 133) ; Pythium, 

 322 ; Vaucheria, 297 (fig. 110). 



Oospore. See fertilisation, zygote. 



Open vascular bundles, 123. 



Operculum, 349 (figs. 128, 129). 



Orange. See Citrus vulgaris (C. Aur- 

 antium). 



Orange G., 454. 



Orchideae, Orchis pallens, embryo-sac 

 and fertilisation, 404 (fig. 147). 



Orchids, mucilage of. See salep. 



Orcin, reagent for inuline, 69. 



Ornithogalum umbellatum, structure 

 of cell-walls of seed, 72 (fig. 26). 



Oscillaria, cell-structure of, 262 (fig. 

 100) ; movement, 263. 



Osmic acid, 1 per cent., use of, 35, 242, 

 292, 296, 302, 342. 



decolorising after, 444 (footnote). 

 Osmunda regalis, germination of 



spores, 362. 

 Osteole, 299. 

 Ovary, adherent (inferior), 397; bilo-' 



cular, 430 ; free (superior), 395 ; 



monocarpellary, 394 ; polycarpel- 



lary, 396. 



dehiscence of, 397. 



philogeny of, 397, 398. 



structure in Brassica, 430 ; Del- 



phinium Ajacis, 394 (fig. 144) ; 



Epilobium, 397 ; Helleborus, 395 ; 



Hemerocallis, 396 ; Hyacinthus, 



396; Lilium, 396; CKnothera, 



397 ; Primula, 397 ; Pyrola, 401 ; 



Tulipa, 396 ; Yucca, 396. 

 Oven, for drying and embedding, 448 



(fig. 157). 

 Overstaining, use of, 249 ; correction 



of, 249, 271. 



Ovular integument, 371. See Ovule. 

 Ovule, 371, 395 ; anatropous, 399, 402 



(figs. 145-8) ; campylotropous, 415, 



433 ; integuments, 433. See also 



embryo-sac, micropyle. 



development and structure in 



Aconitum Napellus, 398 (fig. 145) ; 

 Brassica, 433 ; Capsella Bursa- 

 Pastoris, 412 ; Delphinium, 399 ; 

 Monotropa Hypopitys, 400 (fig. 

 146) ; Orchis, 404 (fig. 147) ; Picea 

 vulgaris, 372 (fig. 134) ; Pinus 

 sylvestris, 371 (fig. 135) ; Torenia, 

 405 (fig. 148). 



