INDEX. 



465 



Cyclas, length of life of. 57. 



Cynipidae, length of life of, 49 ; 

 number of eggs of agamic, 50 ; 

 deposition of eggs of, 94 ; num- 

 ber of males of, 301. 



Cynips, amount of nuclear matter 

 in &%% of, 234 ; parthenogenesis 

 of, 280, 297, 301. 



Cypris, 302. 



Cyto-idioplasm, 184, 187. 



Cytoplasm, 187. 



Daphnidae, segmentation of the 

 ^%% of, 74, 202 ; loss of jaws in 

 development of, 89 ; winter eggs 

 of, 122 ; sperm cells of, 177, 178 ; 

 parthenogenesis of, 233, 334 ; 

 summer eggs of, 242, 244, 245 ; 

 polar bodies in parthenogenetic 

 eggs of, 255, 355, 360. 



Darwin, on constancy of number 

 of individuals in successive gener- 

 ations, 13 ; on Pangenesis, 77, 

 382 ; on atrophy of organs, 86, 

 91; on cross fertilization, 317; 

 on effect of external influences, 



403, 435- 



Daucus, structure of root altered 

 by cultivation, 427. 



Death, origin of, 20, 21, 144; re- 

 lation to reproduction. 21, 120, 

 I33» 155; necessity of, 23, 24, 

 134, 160; utility of, 24, 112, 136, 

 155 ; an adaptation produced by 

 natural selection, 24, 28, 60 ; 

 not universal, 25, 27, in, 119; 

 by sudden shock, 64 ; meaning 

 of, 113; definition of, 114; of 

 the soma, 156. 



Degeneration of organs, see A- 

 trophy. 



Detmer, on transmission of ac- 

 quired characters in plants, 402. 



Development amongst Protozoa, 

 150. 



Diatomaceae, fission of, 66. 



Dicyemids, 132. 143. 



Diptera, length of life of, 42 ; pole 

 cells of, 200, 210, 214, 220; as 

 fertilizers of flowers, 318. 



Doderlein, on tailless cats, 402, 



441, 443- 

 Dragon-flies, length of larval life 



H 



of, 16 ; length of life of imago, 17, 

 40. 



Dryophanta, length of life of sum- 

 mer generation of, 50 ; of winter 

 generation, 50. 



du Bois Reymond, on the trans- 

 mission of acquired characters, 

 83, 402, 434. 



Duration of life governed by 

 needs of species, 9. 



Diising, on origin of sex, 244, 246. 



Eagles, length of life of, 12, 37 ; 

 weight of, 14. 



Echinodermata, origin of germ- 

 cells, 205. 



Echinus, polar bodies of, 362. 



Ectocarpus, male parthenogenesis 

 in, 253. 



Eggs, number laid by various birds, 

 12, 37; of insects, 17. 



Eider-ducks, length of life of, 11. 



Eimer, on the inheritance of muti- 

 lations, 438. 



Eleodes grandis, and dentipes, 

 length of life of imago of, 48. 



Elephants, length of life of, 6 ; 

 gestation of, 7. 



Encystment, relation to death of, 

 112, 115, 116, 120, 160; pro- 

 tective, 117, 121; of Rhizopoda, 

 122. 



Entoniscidae, unequal length of 

 life in male and female, 59. 



Ephemeridae, length of life of 

 imago of, 40, 158. 



Epigenesis, theory of, 325. 



Eristalis tenax, length of life of, 



43- 

 Estheridae, 233. 

 Euglypha, identity of products of 



Assign of, 26, 65, 66. 

 Eupithecia, length of life of, 46. 



Falcons, length of life of, 12, 37. 



Fiedler, on polar bodies in sponges, 

 222. 



Flemming, on nuclear division, 

 191, 236, 370, 372. 



Flourens, on length of life, 7. 



Fol, on fusion of nuclei, 177, 192; 

 on origin of ova, 226 ; on mul- 

 tiple impregnation, 241, 243, 393 ; 



