INDEX. 



Abutilon, polymorphic flowers of, pp. 



320, 323. 

 Acanthia lectularia, length of life of, 



42. 



Acineta, 151. 

 Acquired characters, meaning of, 169 ; 



on supposed botanical proofs of trans- 

 mission of, 390, 397. 

 Acridium migratorium, length of life 



of, 40. 

 Actinia mesembryanthemum, length of 



life of, 54. 



Actinosphaerium, 117, 118. 

 Activity and length of life, 7, 8. 

 Adansonia, length of life of, 6. 

 Adler, on the formation of galls, 302. 

 After-effects, 403. 

 Agliatau, deposition of eggs, 18 ; length 



of life of, 1 8, 59. 



Algae, immortality of unicellular, 25. 

 Amoeba, length of time of fission of, 8 ; 



immortality of, 25 ; fission of, 25, 64. 

 Amphibia, polar bodies of, 340, 352. 

 Amphileptus meleagris, fission of, 148. 

 Amphorina coerulea, polar bodies of, 



189. 



Anabiosis, 25, 38. 

 Ancylus, length of life of, 56. 

 Andricus, length of life of summer 



generation, 50. 

 Anisotropism, 400. 

 Anlagen, 192. 



Anodonta, length of life of, 56, 57. 

 Ants, duration of life of male and female, 



1 8, 48, 50, 51, 52, 59, 156. 

 Aphilotrix, length of life of imago of, 



50. 



Aphis, length of life of, 41 ; partheno- 

 genesis of, 228, 289; polar bodies of, 



349- 



Apis, see Bees. 

 Apus, 152, 324. 

 Ascaris, 133, 144; fertilization of, 177; 



nuclear division in ovum of, 188, 232, 



360 ; spermatogonia of, 2 20 ; spermato- 



genesis of, 375. 



Ascidians, length of life of, 57. 

 Atavism, 179. 

 Atrophy, of organs, 85, 86. 

 Auerbach, on fertilization, 355. 



Bacteria, in dead Cockchafer, 46. 

 Baer, von, 194; on the influence of 

 maternal impressions on the offspring, 



445- 



Balanus, polar bodies of, 218. 



Balbiani, on nuclear division, 187 ; oil 

 pole-cells, 197 ; on origin of ova, 222. 



Balf our, on impregnation, 175; on polar 

 bodies, 214, 225, 339, 345, 353. 



Bear, length of life of, 13. 



Bees, length of larval life of, 15 ; length of 

 life of queen of, 18,52, 156; of drones, 

 !8, 53; of workers, 52, 59, 156 ; acti- 

 vity of, 48 ; oviposition of, 52, 54 ; death 

 of male, 63, 120, 132 ; loss of limbs in 

 development of larva, 89 ; nuptial 

 flight of, 93 ; development of eggs of, 

 226, 234, 285, 351. 



Begonia, propagation of, 211. 



Beneden, van, on fertilization in Ascaris, 

 177, 188, 355, 360; on polar bodies, 

 214, 340, 345, 353 ; on Polkbrperchen, 

 216; on spermatogonia in Ascaris, 220, 

 375 ; on nuclear division, 231 ; on sexual 

 reproduction, 282. 



Berthold, on male parthenogenesis, 247. 



Bessels, on importance of fertilization, 



235- 

 Beyerinck, on the formation of galls, 



302. 



Biorhiza, length of life of imago of, 50. 

 Birds, length of life of, u, 36; factors 



in duration of life of, 12. 

 Blackbird, length of life of, 6, 1 1 , 36. 

 Blaps, length of life of imago of, 47, 48. 

 Blastogenic characters, 412. 

 Elochmann, on polar bodies, 349. 

 Blow-flies, length of larval life of, 15. 

 Boar, length of life of, 14. 

 Bombinator igneus, nature of ovum of, 



125- 



Bombus, 53. 

 Bombyces, flight of females impeded by 



eggs, 17 ; habits of, 44. 

 Bonellia viridis, unequal length of life 



of male and female, 59. 

 Bonnet, on rudimentary tails in dogs, 



428. 

 Born, on position of nucleus in ova, 



177 ; on double impregnation, 382. 



Gg 



