INDEX. 



453 



Neuroterus, length of life of summer 

 generation, 49 ; of winter generation, 

 50. 



Nigella, production of double flowers of, 

 408. 



Nightingale, length of life of, 1 1, 36. 



Nothnagel, on the cause of epilepsy, 



SH- 



Nuclear plate, 187. 



Nuclei, behaviour during fission, 118, 

 1 88; connection of heredity with 

 fusion of, 178; influence of, 184; in- 

 fluence in regeneration, 185 ; nutrition 

 of, 187. 



Nucleoplasm, 179, 185, 191, 227; his- 

 togenetic, 213; ovogenetic, 213, 230, 

 243; spermogenetic, 220, 243. 



Nussbaum, on heredity, 172, 195, 206; 

 on regeneration amongst Infusoria, 185, 



Obelia, origin of germ-cells of, 208. 

 Obersteiner, on inheritance of epilepsy 



in guinea pigs, 311, 313. 

 Ophiostomum, karyokinesis in ovum of, 



368. 



Orgyia, 44. 

 Orth, on the transmission of acquired 



characters, 41 1. 

 Orthonectides, 120, 126; figure of, 



127; degeneracy of, 130, 131, 141, 



152. 



Orthoptera, duration of life of, 39. 

 Ostracod.es, parthenogenesis of, 294, 



325 ; polar bodies of, 350. 

 Otostoma. Carter!, fission of, 148. 



Palingenia, sub-imago stage of, 19, 40. 

 Paludinidae, length of life of, 56. 

 Pandorina, 202, 248 ; figure of, 203. 

 Pangenesis, theory of, 77, 165, 166, 



193, 316, 327. 

 Panmixia, principle of, 90, 140, 291, 



43- 

 Papaver, production of double flowers of, 



408. 

 Paranucleus, 376 ; of the sperm-cell, 



221. 



Parrots, length of life of, 36. 

 Parthenogenesis, the origin of, 225, 



290, 323, 339 ; not ancestral, 228; of 



bees, 235 ; partial, 238 ; explanation 



of, 243; male, 247; of Cynips, 273; 



not perpetual, 283, 285. 

 Pasimachus, length of life of, 48. 

 Pemphigus terebinth!, length of life of, 



41. 

 Petromyzon, impregnation of, 1 75, 247; 



polar bodies of, 218. 

 Pfeffer,on chemical attraction of oosphere, 



247. 

 Pfitzner, on nuclear division, 187. 



Pfluger, on heredity, 70, 175, 355 ; on 

 the inheritance of acquired characters, 

 81, 390, 422 ; on isotropism of the ovum, 

 176. 



Phanerogams, fertilization of, 178, 247; 

 development of pollen grains of, 222. 



Pheasant, the length of life of the golden, 

 36. 



Philodina, polar bodies of, 350. 



Phryganea grandis, 41. 



Phylloxera vastatrix, length of life of, 

 41 ; unequal length of life in two sexes 

 of, 58 ; parthenogenesis of, 294. 



Pieris napi, length of life of, 44. 



Pig, length of life of, 6. 



Pigeon, length of life of, 36 ; cross- 

 breeding of, 332. 



Pike, length of life of, 6. 



Pisidium, length of life of, 56. 



Planorbis, length of life of, 56. 



Plants, duration of life of, 32, 65. 



Polar bodies, 188, 218, 245; the signi- 

 ficance of, 212, 225, 339 ; of Sponges, 

 217 ; in parthenogenetic eggs, 249, 

 345 3^3 5 of Rabbit, 339 ; number of, 

 346 ; significance of second, 353, 362 ; 

 in plants, 377. 



Pole-cells, of Diptera, 197. 



Polistes gallica, ' workers 'of, 53 ; length 

 of life of males and females, 54. 



Pollen-grains, 222. 



Polyphemus, spermatozoa of, 176 ; sum- 

 mer eggs of, 239 ; polar bodies of, 345. 



Polyplastides, definition of, 120, 122, 

 125, 159 ; development of, 152. 



Polyzoa, lepgth of life of. 57. 



Poulton, on colours of caterpillars, 

 394 ; on cats with supernumerary toes, 

 426. 



Proteus, 87. 



Protomyxa aurantiaca, 149. 



Protozoa, development amongst, 1 50 ; 

 conjugation of, 287. 



Psorosperms, 150. 



Psychidae, length of life of, 16, 44, 45, 

 157 ; deposition of eggs of, 18 ; death of 

 female, 63, 132 ; parthenogenesis of, 



293- 



Pulex irritans, length of life of, 42. 

 Pupa, length of life of, 55. 



Rabbit, polar bodies of, 339. 



Rauber, on heredity, 172. 



Ravens, length of life of, 36. 



Regeneration of lost parts, 65 ; in In- 

 fusoria, 185. 



Rejuvenescence, 112, 116, 124, 132, 

 i53> 283. 



Reproduction, original form of, 122 ; 

 effect of monogonic, 273, 275 ; amphi- 

 gonic, 279, 281, 287. 



Reproductive cells, 27, 28, in. 



