452 



LNDKX. 



tion to chromatin, 217 ; two kinds of, 

 245 ; various combinations of, 276. 



Imago, lenijth of life of, 16. 



Immortality, injurious to species, 24 ; 

 of unicellular organisms, 25, 27, 33. 



Infusoria, immortality of, 25, 72 ; re- 

 generation of lost parts in, 27, 185 ; 

 fission of, 64 ; encystment of, 117. 



Insects, duration of life amongst, 15; 

 duration of larval life of, 15; normal 

 death of, 22; duration of imaginal life 

 of, 38 ; segmentation of egg of, 73 ; 

 deposition of eggs, 93 ; origin of genn- 

 cells of, 202 ; polar bodies of, 218. 



Instinct, 83; origin of, 91, 389; used 

 but once in a lifetime, 93. 



Isoiropism, of the ovum, 176. 



Ivy, climbing shoots of, 393, 399. 



Jager, on heredity, 172, 206. 

 Jordan, on varieties, 269. 

 Julin, on spermatogenesis in Ascaris, 

 375- 



Kallima, mimicry of, 280, 306. 



Kant, on the transmission of mutilations, 



423- 



Karyokinesis, 359, 375. 

 Keim, see, Germ. 

 Kirchner, on development of Volvox, 



204. 

 Kblliker, on nature of spermatozoa, 



175; on embryonic cells, 196. 



Lagynus, fission of, 148. 



Lamarck, on use and disuse, 83, 84, 



33, 387- 39 1 - 421. 

 Lamellibranchiata, length of life of, 



55- 



Larvae, length of life of, 15. 



Lasius flavus, length of life of, 50 ; L. 

 niger, 51. 



Lepidoptera, length of life of imagos of, 

 43, 156; parthenogenesis among, 226, 

 352 ; spermatogenesis in, 375 



Lepisma saccharina, length of life of, 

 40. 



Leuckart, on relation of absorbing sur- 

 face to size of animal, 7 ; on develop- 

 ment of Bees, 235 ; on the influence of 

 maternal impressions on the offspring, 



445- 



Limnadia Hermanni, 152. 

 Limnaeus, length of life of, 56. 

 Lion, length of life of, 13. 

 Lister, on chromatophores of blind 



Frogs, 301. 



Locusta, length of life of imago of, 39. 

 Lotze, on activity in connection with 



longevity, 7. 

 Lucanus cervus, length of life 



"*'. 47- 



Lycaena violacea, length of life of imago 



of, 44. 

 Lynceinae, ppermatazoa of, 176. 



Macroglossa stellatarum, length of life 

 of female of, 45. 



Magosphaera planula, 75, 120, 122, 

 126, 147, 152 ; figure of, 123. 



Magpies, length of life of, 36. 



Mammals, duration of life of, 38. 



Manx cats, 427, 430. 



Maternal impressions, supposed in- 

 fluence on offspring, 444. 



May-flies, length of larval life of, 15; 

 length of life of imago of, 16 ; habitat 

 of larvae of, 17; shortening of life of, 

 19 ; death of, 120. 



Meldola, 395. 



Melolontha vulgaris, see Cockchafer. 



Mesozoa, 128. 



Metazoa, 27, 28, in, 145; old age of, 



157- 



Metschnikoff, on pole-cells, 197. 



Micellae, 190, 194. 



Mimetic forms, 264, 280. 



Mimosa, ' after effects ' in, 404. 



Minot, on cyclical development, 199; 

 on polar bodies, 214, 225, 340, 345, 

 353- 



Moina, winter eggs of, 118, 240; seg- 

 mentation of, 199; polar bodies of, 

 218. 



Molluscs, length of life of, 55 ; deter- 

 mined by markings on shell, 14; 

 enemies of, 58. 



Monoplastides, 115, 122, 125, 146, 159; 

 definition of, 120; reproduction of, 

 149- 



Mouse, length of life of, 6 ; gestation of, 

 7- 



Miiller, F., on heredity of acquired cha- 

 racters, 320, 322. 



Muller, H., on colours of flowers, 259 ; 

 on nectaries, 307. 



Multicellular organisms, division of 

 labour in, 27. 



Musca domestica, length of life of, 43. 



Musca vomitoria, polar bodies of, 353. 



Myopia, 89. 



Nageli, 167, 171, 175; on idioplasm, 

 174, 182, 190, 201, 340. 414; on in- 

 herent tendency to vary, 256, 298 ; on 

 Alpine plants, 269 ; on adaptation, 

 300; on medium of heredity, 318, 



355- 



Najadac, length of life of, 56. 

 Natica neros, length of life of, 56. 

 Nautilus, persistence of, 300. 

 Nematodes, polar bodies of, 188 ; nii- 



i-li-iir division of ovum of, 234, 36S. 

 Neuroptera, length of lif- of, 40. 



