INDEX OF SUBJECTS 



481 



Macrobdella, 305. 



Macrogamete, 226. 



Macromeres, 371. 



Mammals, spermatozoa, 139, 169; young 

 ova, 155. 



Mantle-fibres, 78, 105. 



Marsilia, 175. 



Maturation (see Reduction), 234; theoreti- 

 cal significance, 243; of parthenogenetic 

 eggs, 280; nucleus in, 353. 



Medusae, dwarf embryos, 410. 



Meristem, nuclei of, 340. 



Metamerism, 390. 



Metanucleus, 128. 



Metaphase, 69. 



Metaplasm, 19. 



Micellae, 291. 



Microcentrum, 311, 315, 324. 



Microgamete, 226. 



Micromeres, 371. 



Micropyle, 124, 133. 



Microsomes, 23; of the egg-cytoplasm, 131; 

 nature of, 289, 290, 293 ; of the astral sys- 

 tems, 318, 326; of the nucleus, 301, 303; 

 relation to centrosome, 315; staining- 

 reactions, 337. 



Microsphere, 324. 



Microzyma, 291. 



Mid- body, 71, 78. 



Middle-piece, 135, 139; origin, 161, 165- 

 170; in fertilization, 187, 212. 



Mitosis, 64; general outline, 65; modifica- 

 tions of, 77; heterotypical, 86; in unicellu- 

 lar forms, 87; pathological, 88; multipolar, 

 97; mechanism of, IOO; physiological sig- 

 nificance, 351; Roux-Weismann concep- 

 tion of, 245, 406. 



Mitosome, 165. 



Mitotic figure (see Mitosis, Spindle), 69; 

 origin, 72; varieties, 78. 



Molgula, 158. 



Mouse, fertilization, 185, 193. 



Musca, ovum, 142. 



Myriapods, spermatozoa, 142; yolk-nucleus, 

 156. 



Myzostoma, fertilization, 196, 208. 



Naias, 266. 



Nebenkern, pancreas-cells, 44; of spermatid, 



163, 165. 



Nebenkorper, 164, 165. 

 Neclnrus, pancreas-cells, 44. 

 Nematodes, germ-nuclei, 184. 

 Nereis, asters, 49; perivitelline layer, 131; 



ovum, 129; deutoplasm, 131; fertilization, 



191 ; attraction-sphere and centrosome, 

 325; cleavage, 366, 369; pressure-experi- 

 ments on, 411. 



Nerve-cell, 48. 



Net-knot, 34. 



Noctiluca, mitosis, 93; flagellum, 171; con- 

 jugation, 227; sphere, 319. 



Nuclear stains, 335. 



Nuclein, 33, 332; staining-reactions, 334; 

 physiological significance, 340. 



Nuclein-bases, 331. 



Nucleinic acid, 33, 332-334; staining-reac- 

 tions, 334 ; physiological significance, 

 340. 



Nucleo-albumin, 331, 334. 



Nucleo-proteid, 331, 334. 



Nucleolus, 33; in mitosis, 67; of the ovum, 

 126; physiological meaning, 128. 



Nucleoplasm, 21. 



Nucleus, general structure and functions, 



. 31; finer structure, 37; polarity, 36, 294; 

 chemistry, 41; in mitosis, 65; of the 

 ovum, 125; of the spermatozoon, 135, 137; 

 relation to cytoplasm, 302; morphological 

 composition, 294; in organic synthesis, 

 340, 430; physiology, 341; position and 

 movements, 346; in fertilization, 181,352; 

 in maturation, 353; in later development, 

 425; in metabolism and inheritance, 430; 

 in inheritance and development, 341, 358, 

 405, 425, 431 ; control of the cell, 426. 



Nurse-cells, 151. 



(Edigonium, fertilization, 181; membrane, 

 346. 



Onoclea, 175. 



Oocyte, 236. 



Oogenesis, 234, 236. 



Oogonium, 236. 



Oosphere, 133. 



Ophryotrocha, amitosis, 115; nurse-cells, 

 151; fertilization, 189, 193; tetrads, 258. 



Opossum, spermatozoa, 142. 



Organization, 289, 291; of the nucleus, 294, 

 301; of the egg, 397, 433. 



Origin of species, 3. 



Osmunda, reduction, 275. 



Ovary, 123; of Canthocamptus, 273. 



Ovum, in general, 8, 9; detailed account, 

 124; nucleus, 125; cytoplasm, 130; en- 

 velopes, 132; of plants, 133; origin and 

 growth, 150; fertilization, 178; effects of 

 spermatozoon upon, 201 ; maturation, 236; 

 parthenogenetic, 280; promorphologyj 

 378; bilaterality, 382. 



