468 



INDEX. 



Mouse, length of life of, 6 ; gesta- 

 tion of, 7. 



Muller, F., on heredity of acquired 

 characters, 328, 331. 



Muller, H., on colours of flowers, 

 266 ; on nectaries, 316. 



Multicellular organisms, division 

 of labour in, 28. 



Musca domestica, length of life 



of, 43- 

 Musca vomitoria, polar bodies of, 



363- 

 Myopia, 90. 



Ij-jigeli, 169, 173, 178; on idio- 

 plasm, 177, 185, 193, 204, 351, 

 427 ; on inherent tendency to 

 vary, 262, 306 ; on Alpine plants, 

 276 ; on adaptation, 308 ; on 

 medium of heredity, 327, 366. 



Najadae, length of life of, 57. 



Natica heros, length of life of, 57. 



Nautilus, persistence of, 308. 



Nematodes, polar bodies of, 191 ; 

 nuclear division of ovum of, 238, 



371, 375- 

 Neuroptera, length of life of, 41. 

 Neuroterus, length of life, 50. 

 Nigella, production of double 



flowers of, 421. 

 Nightingale, length of life of, 11, 



36. 



Nothnagel, on the cause of epi- 

 lepsy, 322. 



Nuclear plate, 190. 



Nuclei, behaviour during fission, 

 118, 191; connection of heredity 

 with fusion of, 181 ; influence of, 

 187 ; influence in regeneration, 

 t88; nutrition of, 190. 



Nucleoplasm, 182, 188, 194, 232; 

 histogenetic, 217; ovogenetic, 

 217, 235, 248 ; spermogenetic, 

 225, 249. 



Nussbaum, on heredity, 174, 198, 

 210; on regeneration amongst 

 Infusoria, 188, 204. 



Obelia, origin of germ-cells of, 212, 

 Obersteiner, on inheritance of 



epilepsy in guinea pigs, 319, 322. 

 Ophiostomum, karyokinesis in 



ovum of, 379. 



Orgyia, 44. 



Orth, on the transmission of ac- 

 quired characters, 424. 



Orthonectides, 121, 127; figure 

 of, 128 ; degeneracy of, 131, 132, 



143. 154 

 Orthoptera, duration of life of, 



39. 

 Ostracodes, parthenogenesis of, 



301, 334 ; polar bodies of, 360. 

 Otostoma Carteri, fission of, 150. 



Palingenia, sub-imago stage of, 



20, 40. 

 Paludinidae, length of life of, 57. 

 Pandorina, 206, 253 ; figure of, 



207. 

 Pangenesis, theory of, 78, 168, 



169, 196, 324, 336. 

 Panmixia, principle of, 91, 141, 



299, 442. 

 Papaver, production of double 



flowers of, 421. 

 Paranucleus, 388 ; of the sperm- 

 cell, 226. 

 Parrots, length of life of, 36. 

 Parthenogenesis, the origin of, 



229, 297, 332, 343 ; not ancestral, 



233 ; of bees, 240 ; partial, 242 ; 



explanation of, 248 ; male, 253 ; 



of Cynips, 280 ; not perpetual, 



290, 292. 

 Pasimachus, length of life of, 48. 

 Pemphigus terebinthi, length of 



life of, 41. 

 Petromyzon, impregnation of, 178, 



252 ; polar bodies of, 222. 

 PfeflEer, on chemical attraction of 



oosphere, 252. 

 Pfitzner, on nuclear division, 191. 

 Pfliiger, on heredity, 70, 1 78, 365 ; 



on the inheritance of acquired 



characters, 81, 402. 434 ; on 



isotropism of the ovum, 179. 

 Phanerogams, fertilization of, 181, 



252 ; development of pollen 



grains of, 227. 

 Pheasant, the length of life of the 



golden, 36. 

 Philodina, polar bodies of, 361. 

 Phryganea grandis, 41. 

 Phylloxera vastatrix, length of 



life of, 41 ; unequal length of life 



