INDEX. 



467 



Immortality, injurious to species, 

 24 ; of unicellular organisms, 26, 



27, 34- 



Infusoria, immortality of, 26, 72 ; 

 regeneration of lost parts in, 27, 

 188 ; fission of, 65 ; encystment 

 of, 117. 



Insects, duration of life amongst, 

 15 ; duration of larval life of, 

 15 ; normal death of, 22 ; dura- 

 tion of imaginal life of, 38 ; seg- 

 mentation of &%^ of, 74 ; de- 

 position of eggs, 94 ; origin of 

 germ-cells of, 205 ; polar bodies 

 of, 222. 



Instinct, 83 ; origin of, 92, 401 ; 

 used but once in a lifetime, 94. 



Isotropism, of the ovum, 179. 



Ivy, climbing shoots of, 405, 412. 



Jager, on heredity, 174, 209. 

 Jordan, on varieties, 276. 

 Julin, on spermatogenesis in As- 

 caris, 387. 



Kallima, protective resemblance 

 of, 287, 315. 



Kant, on the transmission of mu- 

 tilations, 435. 



Karyokinesis, 370, 387. 



Keim, see Germ. 



Kirchner, on development of Vol- 

 vox, 208. 



K6lliker,on nature of spermatozoa, 

 177 ; on embryonic cells, 200. 



Lagynus, fission of, 150. 

 Lamarck, on use and disuse, 84, 



311, 399. 403, 433- 

 Lamellibranchiata, length of life 



of, 56. 



Larvae, length of life of, 15. 



Lasius flavus, length of life of, 

 51 ; L. niger, 52. 



Lepidoptera, length of life of 

 imagos of, 44, 158; partheno- 

 genesis among, 231, 363 ; sper- 

 matogenesis in, 387, 



Lepisma saccharina, length of life 

 of, 40. 



Leuckart, on relation of absorbing 

 surface to size of animal, 7 ; on 

 development of Bees, 240 ; on 



H h 



the influence of maternal im- 

 pressions on the offspring, 458. 



Limnadia Hermanni, 154. 



Limnaeus, length of life of, 57. 



Lion, length of life of, 14. 



Lister, on chromatophores of blind 

 Frogs, 310. 



Locusta, length of life of imago of, 



39- 

 Lotze, on activity in connection 



with longevity, 7. 

 Lucanus cervus, length of life of 



imago of, 47. 

 Lycaena violacea, length of life of 



imago of, 45. 

 Lynceinae, spermatozoa of, 178. 



Macroglossa stellatarum, length 

 of life of female of, 45. 



Magosphaera planula, 76, 121, 

 123, 127, 149, 154; figure of, 124. 



Magpies, length of life of, 36. 



Mammals, duration of life of, 38. 



Manx cats, 439, 442. 



Maternal impressions, supposed 

 influence on offspring, 457. 



May-flies, length of larval life of, 

 16; length of life of imago of, 

 16; habitat of larvae of, 17; 

 shortening of life of, 20 ; death 

 of, 121. 



Meldola, 169, 401, 407. 



Melolontha vulgaris, see Cock- 

 chafer. 



Mesozoa, 129. 



Metazoa, 28, iii, 146; old age of, 



159- 

 Metschnikoff, on pole-cells, 200. 

 Micellae, 194, 197. 

 Mimetic forms, 270, 287. 

 Mimosa, 'after-effects' in, 416. 

 Minot, on cyclical development, 



203 ; on polar bodies, 218, 229, 



350- 355> 364- 

 Moina, winter eggs of, 118, 245 ; 



segmentation of, 202 ; polar 



bodies of, 222. 

 Molluscs, length of life of, 55 ; 



determined by markings on shell, 



15 ; enemies of, 58. 

 Monoplastides, 115, 122, 126,148, 



i6i ; definition of, lao ; repro- 

 duction of, 150. 



