INDEX 



439 



Nitzschia, 207 (fig.). 



Nodules of Leguminosae, etc., 267, 



268. 

 Non-essential organs of flowers, 



354- 



Non-reducing sugars, 47. 



Non-vascular plants, 180 et seq. 



Nosepiece (of microscope), 398. 



Nostoc, 205, 206 (fig.), 259. 



Nucellus of, Angiosperms, 357 (fig.), 

 358 (fig.), 359, 365, 371, 37 2 ; 

 Conifers, 348, 349 (fig.), 350, 

 353 ; Cycads, 325 (fig.), 326, 

 327 (fig.) ; Lyginopteris, 331, 



333 (ng.). 



Nuclear division, direct, 21 ; in- 

 direct, 20-25 (figs.) ; in spore- 

 mother cells, 305-7 (fig.), 385; 

 in vegetative cells, 24, 25. 



Nuclear membrane, 3, 22, 24. 



Nuclear sap, 22. 



Nuclear spindle, 21 (fig.), 23 (fig.), 

 306, 307 (fig.). 



Nuclei, 2 (fig.), 3, 4, 5 (fig.), 7 (fig.), 

 50 ; function of, 3, 385, 389 ; 

 fusion of, 184, 222, 234, 238, 

 245, 247, 281, 306, 350, 366, 

 368, 389 ; and heredity, 389, 

 390. 



Nuclei of, ascus, 245 ; Bacteria, 

 262 ; Cladophora, 196 (fig.), 

 208 ; Cyanophyceae, 205, 210 ; 

 Fungi, 231 ; laticiferous ele- 

 ments, 153 ; CEdogonium, 208, 

 217 (fig.) ; Rust Fungi, 247 ; 

 spermatozoids, 277, 278 (fig.) ; 

 Vaucheria, 198, 218 (fig.) ; 

 Yeast (Saccharomyces), 255, 

 256 (fig.). 



Nucleolus, 2 (fig.), 3, 21 (fig.), 22, 

 24, 306. 



Nutrition, 40, 183, 188, 220 ; and 

 sex of Equisetum - prothalli, 

 313 ; in plants and animals 

 compared, 194 ; of embryos, 

 302, 320, 321, 326, 332, 351, 

 367, 370, 373 ; of Moss-sporo- 

 gonium, 284 ; of secondary 

 wood, 124. 



Nymphcea, 101, 356. 



Oak (Quercus), 130, 364, 391 ; bark 



of, 60, 141 ; cork of. 140 ; 



wood of, 28, 35 (fig.), 122, 128 



(ng.). 

 Oat (A vena), 53 ; fungal diseases 



of, 241, 248 ; starch of, 43. 

 Obelia, 193, 



Obione portulacoides, hairs of, 94 

 (fig.) ; secondary thickening 

 of, 133- 



Objective, 398, 400. 



Ocular, 398. 



CEdogonium, habitat of, 195 ; 

 sexual reproduction of, 217 

 (fig.), 220-23 (fig.), 226; 

 structure of, 195, 197, 208, 217 

 (fig.) ; zoospores of, 216, 217 



(fig.). 



CEdogonium concatenatum, 217 (fig.), 

 221 (fig.) ; O. diplandrum, 221 

 (fig.) ; O. landsboroughi, 221 

 (fig.) ; O. pachyandrium, 217 

 (fig.), 221 (fig.). 



CEnanthe crocata, stem-structure of, 

 86. 



CEnothera, 389 ; O. lamarckiana, 

 mutation in, 381, 382. 



Oidium, 243. 



Oil-cake, 50. 



Oils, 40, 49, 50, 53, 155, 351 ; in 

 Fungi, 231 ; in oospores, 223 ; 

 in Vaucheria, 208 ; in zygo- 

 pores, 185 ; reactions of, 49. 



Oils, volatile or ethereal, 62, 63, 64, 

 105, 106, 126, 151. 



Old Man's Beard (Usnea), 258 (fig.). 



Olea euvopcBa, 49. 



Oleander (Nerium oleander), leaf- 

 structure of , no, 161 (fig.), 162. 



Oleic acid, 49. 



Olive (Olea europced), 49. 



Olive oil, 49. 



One-sided bordered pits, 122. 



Onion (A Ilium cepa), 45 ; cell- 

 structure of, i, 2 (fig.), 3, 

 26 ; epidermis of, 94 (fig.), 97 

 (fig-), 99 ; stamens of, 359 

 (fig-)- 



Oogamy, 220, 221 (fig.), 223, 226, 

 234, 238. 



Oogonium of, Cystopus, 233 (fig.), 

 234 ; Fucus, 221 (fig.), 224, 



225 (fig.) ; CEdogonium, 217 

 (fig.), 221 (fig.), 222 ; Pelvetia, 



226 ; Vaucheria, 221 (fig.), 224. 

 Oomycetes, 231-6 (figs.), 238, 406. 

 Oospore of, Algae, 221 (fig.), 223, 



224, 226 ; Angiosperms, 368 ; 

 Conifers, 350 ; Cycads, 326 ; 

 Ferns, 302 ; Fungi, 233 (fig.), 

 234, 236 ; Liverworts and 

 Mosses, 281 ; Selaginella, 319. 



Open grain of wood, 127. 



Opening of stomata, 98,-joo (fig.), 



Opium, 61, 



