450 



1XDKX. 



Bosmina, parthogenesis of, 325. 

 Brooks, on heredity, 166, 326. 

 Brown- Se"quard, experiments on guinea- 



I, 81, 310, 313. 



Bulimus, length of life of, 55. 

 Buprestia splendens, length of life of, 



47- 



Burdach, on the influence of maternal 

 impressions on the offspring, 444. 



Biitsclili, on polar bodies, 188, 214, 224, 

 340 ; on sexual reproduction, 282 ; on 

 processes of fertilization, 355. 



Butterflies, climatic varieties of, 99 ; 

 death of, 120. 



Bythotrephes, spermatozoa of, 176 ; sum- 

 mer eggs of, 239; winter eggs of, 348. 



Calberla, on impregnation in Petromy- 



zon, 175. 

 Canary birds, length of life of, 36 ; 



plumage of, 321. 

 Carabus auratus, length of life of imago 



of, 47. 

 Carnoy, on karyokinesis in ovum of As- 



caris, 360, 368 ; on spermatogenesis, 



375- 



Carp, length of life of, 6. 



Cat, length of life of, 6. 



Catallacta, 123. 



Caterpillars, length of life of phytopha- 

 gous, 15. 



Cells, renewal of, 21 ; nourishment of, 

 29 ; death of, 59. 



Cephalopods, length of life of, 56. 



Cerambyx heros, length of life of imago 

 of, 47. 



Cetochilus, polar bodies of, 218. 



Chermes, parthogenesis of, 294 ; galls 

 of, 401. 



Cherry-tree, in Ceylon, 406. 



Chrysomela varians, ovoviviparous de- 

 velopment of, 48, 49. 



Chydorus, parthenogenesis of, 325, 



Cicada, length of life of, 41, 42. 



Cienkowsky, on conjugation, 286. 



Cionea intestinalis, length of life of, 



57- 



Circumcision, 434. 

 Cirrhipedes, complementary males of, 



58. 



Clausilia, length of life of, 55. 

 Cockchafer, length of larval life of, 16 ; 



length of imaginal life of, 46. 

 Coleoptera, length of life of. 46. 

 Colpoda cucullus, fission of, 148. 

 Conjugation, 282, 286. 

 Continuity of germ-plasm, 104. 

 Copepods, unequal length of life in the 



two sexes of parasitic, 58. 

 Coryne, origin of sexual bud, 205. 

 Cossus ligniperda, length of larval life 



of, 15. 



Crayfish, length of life of, 6. 



Cuckoo, length of life of, n, 36. 



Cyclas, length of life of, 56. 



Cynipidae, length of life of, 49 ; num- 

 ber of eggs of agamic, 50 ; deposition 

 of eggs of, 93 ; number of males of, 293. 



Cynips, amount of nuclear matter i 

 of, 229; parthenogenesis of, 274, 290, 



293- 



Cypris, 294. 



Cyto-idioplasm, 181, 184. 

 Cytoplasm, 184. 



Daphnidae, segmentation of the egg of, 

 73, 199 ; loss of jaws in development <-f, 

 89 ; winter eggs of, 121; sperm cells of, 

 175, 176 ; parthenogenesis of, 228, 325 ; 

 summer eggs of, 236, 239, 240 ; polar 

 bodies in parthenogenetic eggs of, 249, 



345. 35- 



Darwin, on constancy of number of in- 

 dividuals in successive generations, 1 2 ; 

 on Pangenesis, 77, 370 ; on atrophy of 

 organs, 85, 90 ; on cross fertilization, 

 309 ; on effect of external influences, 



39 T 423- 



Daucus, structure of root altered by 

 cultivation, 414. 



Death, origin of, 20, 21, 143 ; relation to 

 reproduction, 21, 120, 132, 154; ne- 

 cessity of, 23, 24, 134, 159; utility of, 

 24, 112, 135, 153; an adaptation pro- 

 duced by natural selection, 24, 28, 60 ; 

 not universal, 25, 27, in, 119; by 

 sudden shock, 63; meaning of, 113; 

 definition of, 114; of the soina, 154. 



Degeneration of organs, see Atrophy. 



Detmer, on transmission of acquired 

 characters in plants, 390. 



Development amongst Protozoa, 149. 



Diatomaceae, fission of, 65. 



Dicyemids, 131, 141. 



Diptera, length of life of, 42 ; pole cells 

 of, 197, 206, 210, 216; as fertilizers of 

 flowers, 309. 



Doderlein, on tailless cats, 390, 428,430. 



Dragon-flies, length of larval life of, i 5 ; 

 length of life of imago, 17, 40. 



Dryophanta, length of life of summer 

 generation of, 49 ; of winter genera- 

 tion, 50. 



du Bois Beymond, on the transmission 

 of acquired characters, 82, 390, 422. 



Duration of life governed by needs 

 of species, 9. 



Diising, on origin of sex, 239, 241. 



Eagles, length of life of, n, 37; weight 



of, 14. 

 Echinodermata, origin of germ-cells, 



202. 

 Echinus, ;.i>lar bodies of, 351. 



