408 



INDEX. 



Motion, relations between, and life, 58. 



Mulder on the green of leaves, 231. 



Miiller, Memoir by, on the sounds made 

 by fish, 239. 



Miiller and Gegenbaur, observations on 

 granular nerves by, 382. 



Muscle and nerve, analogous develop- 

 ment of, 386. 



Muscular ti.ssue, assumption as to, in 

 the Annelids, 70. 



Muscularity, contractility apart from, 

 370. 



Myriana, gemmation of the, 61. 



Nais, the gemmation of the, 61 — al- 

 leged i)araly8ing power of the Hydi-a 

 on it, 13.5, 137. 



Nais proboscidea, gemmation of the, 65. 



Naked-eyed Medusae, the, 325. 



Nature, cflfect of study of, on the mind, 

 54, 397. 



Nemertina Borlasia, the, 223. 



Neomelie, 281. See Parthenogenesis. 



Nereis, peculiarity in the, 111. 



Nerine, extraordinary adventures of the 

 crew of the, 223. 



Nerve and muscle, analogous develop- 

 ment of, 386 — stages of development 

 in different orders, 387. 



Nerves, sensations where they are in- 

 visible, 353 — sensibility manifested 

 without, 389. 



Nerve-fibres, and cells, alleged distinc- 

 tion between, 374 — supposed depen- 

 dence of nerve-action on, 376 et se(j. 

 — function of the, 385. 



Nerve-force, and action, relations of, to 

 nerve-fibres, 376 — not conducted by 

 fibres alone, 384. 



Nervous system, connection of sensi- 

 bility to pain with the, 333 — sensi- 

 bilitj' apart from the, 370 — Brown- 

 Sequard's views regarding the, 378. 



Nervous tissue, assumptions as to, 70, 

 71 — is it ever diffused ? ib. — constitu- 

 tion of, 385. 



Noctilucse, the, 325, .326. 



Nudibranchiates, respiration in the, 1 06 

 — structure, &c. of the eye in, 352 

 et seq. 



Nutrition, as a function of life, 58, 59. 



Nymphon gracilc, the, 202. 



Observation, value of, to the Natural- 

 ist, 34. 



Ocean-currents, influence of Molluscs 

 on, 35.0. 



Opliidium, rapid death of, out of water, 

 338. 



Orange-tentacledand disked Anemones, 

 the, 79— their identity, 142. 



Orbigny on the colour -specs of the 

 Loligo, 94. 



Organ, relations of, to function, 59, 393 

 et seq. 



Organic labour, progressive division of, 

 391. 



Organisation, relations of light to, 

 232. 



Ova of the Eolis, &c., peculiaiities of 

 the, 245, 246. 



Ovaries, discover}' of, in the Actiniae, 

 161. 



Owen, Professor, on the Boring Mol- 

 luscs, 84 — on the Eolis, 1 ) 0— on the 

 paralysing power of the Hydra, 135 

 ■ — on the urticating cells, 148 — on the 

 digestive organs of the Pleurobran- 

 chas, 243 — his " Parthenogenesis," 

 281 — on the generation of the Aphis, 

 284 — his lectures on Parthenogenesis, 

 288 — his theory of Parthenogenesis, 

 300 et seq. — examination of it, 304 — 

 on the identity of gemmation and 

 generation, 308 — on pain in the lower 

 animals, 331 — on the eye of inverte- 

 brates, 351 —on the colouring matter 

 in the ganglia of the Doris, 371. 



Oyster, preservation of the, out of 

 water, 339. 



Pagurus, or Hermit crab, habits, &c. 

 of the, 46 et seq. 



Pain, is it felt by the Medusae ? 328 et 

 seq. — the manifestations of, in man, 

 and error in transferring these to the 

 lower animals, 330 — shrinking, cries, 

 &c., not necessarily signs of, 332 — 

 its connection with the nervous 

 system, 333 — sensibilitj' to, a special- 

 isation of the general sensibility, 334 

 — differences of it, 335. 



Paramecium, rapidity of increase of the, 

 314. 



Parthenogenesis, what, 281 et seq. — 

 historj' of its discover}', &c., 282 et 

 seq. — statement of, 292 — new facts in 

 it, 293 et W9.— theories of, 299— 

 author's theoiy of, 320 et seq. 



Pediccllaria of the Star-fish, the, 368. 



Pedicellina, the, 248, 249 — is viviparous 

 as well as oviparous, <S:c., 249. 



Peltier, M., observations of, on Anne- 

 lids, 63. 



Penzance lodging-house, a, 1 82. 



Perch, sexual peculiarity of the, 168. 



Percha scandens, the, 2^8. 



Pholas dactylus, the, 81, 83, 86. 



