INDEX OF SUBJECTS 



369 



Middle-piece, 99, 100, 103; origin, 123, 

 125; in fertilization, 135, 137, 143, 157. 



Mitosis, 46; general outline, 47; modifica- 

 tions of, 57; heterotypical, 60; in uni- 

 cellular |orms, 62; pathological, 67; 

 multipolar, 69; mechanism of, 70-75; 

 physiological significance, 86, 171, 183, 

 256; in fertilization, 134; Roux-Weismann 

 conception of, 104, 305. 



Mitosome, 123. 



Mitotic figure (see Mitosis, Spindle), 50; 

 origin, 53; varieties, 57. 



Mouse, formation of spermatozoon, 126; 

 fertilization, 136. 



Miisca, ovum, 96. 



Myriapods, spermatozoa, 106; yolk-nucleus, 

 117. 



Myzostotna, fertilization, 159. 



Xebenkern, pancreas-cells, 31; archoplas- 

 mic, 53; of spermatid, 123, 125. 



Necturus, pancreas-cells, 31. 



Nematodes, germ-nuclei, 134. 



Nereis, asters, 34; perivitelline layer, 94; 

 ovum, 95; deutoplasrn, 96; fertilization, 

 141; sperm-centrosome, 226; attraction- 

 sphere and centrosome, 233; cleavage, 

 271, 276; pressure-experiments on, 309, 

 310. 



Nerve-cell, 33. 



Net-knot, 24. 



Noctihtca, mitosis, 65; conjugation, 1 68. 



Nuclear stains, 28, 242. 



Nucleic acid, 29, 240; staining-reactions, 

 243; physiological significance, 247. 



Nuclein, 17, 29, 239, 240; staining-reac- 

 tions, 242- 246; physiological significance, 

 247. 



Nucleo-albumin, 239 ; relations to nuclein, 

 241, 243. 



Nucleo-proteid, 242, 243. 



Nucleolus, 14, 24; in mitosis, 49; of the 

 ovum, 91-93; physiological meaning, 93; 

 relation to centrosome, 64, 225. 



Nucleoplasm, 15. 



Nucleus, general structure and functions, 

 22; finer structure, 27; polarity, 26, 215; 

 chemistry, 28; in mitosis, 47, 256; of the 

 ovum, 92; of the spermatozoon, 98, 103; 

 relation to cytoplasm, 214, 238; morpho- 

 logical composition, 215; in organic syn- 

 thesis, 247, 262; physiology, 248; position 

 and movements, 252-256; in fertilization, 

 257; in maturation, 259; in later devel- 

 opment, 321, 327; in metabolism and 

 inheritance, 326; in inheritance and de- 



2 i; 



velopment, 302-311, 317; control of the 

 cell, 322. 

 Nurse-cells, 113, 114, 255. 



(Edigonium, fertilization, 130; membrane, 



252. 



Oocyte, 175, 176. 

 Oogenesis, 173, 175. 

 Oogonium, 175, 176. 

 Oosphere, 97. 



Ophryotrocha, amitosis, 8l; nurse-cells, 113; 



tetrads, 192, 201. 

 Organism, nature of, 41. 

 Organization, 41, 210; of the nucleus, 222; 



of the cytoplasm, 223; of the egg, 299, 



327- 



Origin of species, 4. 



Osmunda, reduction, 196. 



Ovary, 89; of Canthocamptus, 194. 



Ovum, in general, 5, 6; detailed account, 

 90; nucleus, 92; cytoplasm, 94; envel- 

 opes, 96; of plants, 97; origin and growth, 

 113; fertilization, 129; effects of spermato- 

 zoon upon, 149; maturation, 175; parthe- 

 nogenetic, 202; promorphology, 278, 285; 

 bilaterality, 282; in development, 311, 



323- 

 Oxychromatin, 27, 223; staining-reactions, 



244. 

 Oyster, germ-nuclei, staining-reactions, 127. 



Pallavicinia, chromosomes, 49 ; reduction, 

 196. 



Paludina, dimorphic spermatozoa, 104, 106. 



Pangens, 22, 303, 305, 312, 322, 328. 



Pangenesis, 10, 303, 305, 312. 



Parachromatin, 29. 



Paralinin, 29. 



Paramcecium, mitosis, 62; conjugation, 165; 

 reduction, 199. 



Paranucleus, 53; of the spermatid, 123. 



Parthenogenesis, centrosome in, 156; preven- 

 tion of, 91, 176; theories of, 202; polar 

 bodies in, 202-205. 



Petromyzon, fertilization, 142, 147. 



Phallusia, fertilization, 143, 153; centre- 

 sphere, 235. 



Physa, fertilization, 131, 144; reversed cleav- 

 age, 270. 



Physiological units, 22. 



Pieris, spinning-gland, 25, 254. 



Pigment-cells, 72. 



Pihtlaria, fertilization, 160. 



Pinits, reduction, 196. 



Plant-cells, plastids, 37; membranes, 38; 

 mitosis, 57, 59; cleavage-planes, 266. 



