INDEX. 



589 



Neurine, i. 30; ii. 322, 328, 



504 

 Neuroptera, i. 314; ii. 432 

 Neuro-skeleton, i. 327 

 Nexvport, i. 314; ii. 92. 189, 



192,223,225,491 

 Newt, ii. 393 

 Nightshade, ii. 54 

 Nitrogen, ii. 12 

 Nitrogen in plants, ii. 32 

 Nifzsch, ii. 427 

 Nordmann, ii. 525, 538, 546 

 Notonecta, i. 25, 301 

 Nuclei of cells, ii. 315 

 Nucleolus of cells, i, 56 

 Nudibranchiata, ii. 113 

 Nursling sap, ii. 21 

 Nutrition, ii. 1 , 9, U 

 Nutrition in lower orders, ii. 66 

 Nutrition in higher orders, ii. 94 

 Nutritive functions, i. 32 

 Nycteribia, ii. 432 



Oblique muscles, i. 122 

 Oblique muscles of the eye, ii. 



415 

 Oblique processes, i. 352 

 Ocelli, i. 318 

 Octopus, i. 233; ii. 442 

 Oculiir spectra, ii. 467, 471 

 Ocythbe, i. 238 

 Oriier, i. 284 

 Odorous effluvia, ii. 355 

 (Esophagus, ii. 96 

 Oil, ii. 5 

 OAen,i. 312,356 

 Olfactory lobes, ii. 499 

 Olfactory nerve, ii, 354 

 Oliva, i. 215, 223 

 Onchidium, ii. 287 

 Oniscus, ii. 489 

 Onocrotalus, i. 490 

 Operculum, i. 225; ii. 274 

 Ophicephalus, ii. 277 

 Ophidia, i. 398 

 Ophiosurus, i. 404, 407 

 Ophiura, i. 192 

 Opossum, ii. 122, 537 

 Oplic axis, ii. 412,449 



Optic gan^lion, ii. 438 

 Oplic lobes, ii. 499 

 Optic nerves, ii. 401 

 Optical principles, ii. 402 

 Optometer, ii. 423 

 Opuntia, i. 1 19 

 Orache, ii. 42 

 Orbicular bone, ii. 381 

 Orbicular muscles, i. 125 

 Orchidiae, i. 60 

 Organization, i. 50 

 Organization, animal, i. 83 

 Ornithorhynchus, i. 352 ; ii. 122, 



350, 396, 444, 569 

 Orobanche, ii. 49 

 Orthoceratites, i. 239 

 Orthoptera, i. 276, 313 ; ii. 151, 



432 

 Orythia, ii. 64 

 Os coccygis, i. 360 

 Os hyoides, ii. 274 

 Osier, i. 187, 198, 201, 248, 



251 

 Osseous fabric, i. 326 

 Ossicula, tympanic, ii. 380, 395 

 Ossification, i. 335 

 Ostracion, i. 384, 385 

 Ostrich, i. 497, 518, 521 ; ii. 



165, 198, 295, 498 

 Otter, sea, ii. 133 

 Otoconies, ii. 384 

 Otolithcs, ii. 384 

 Ovary, ii. 533 

 Oviduct, ii, 535 

 Oviparous animals, ii. 536 

 Ovula, i. 221 

 Ovum, ii. 533 

 Oxven, ii. 133, 140, 157, 247, 



369 

 Owl, ii. 297, 395, 449 

 Ox, i. 453 ; ii. 142 

 Oxygen, exhalation of, ii. 30 

 Oy.ster,i. 121, 194, 195; ii. 429 

 Oyster-catcher, ii. 117 

 Paces of quadrupeds, i. 436 

 Pachydermala, i. 456, 458 ; ii. 



343, 351 

 Package of organs, i. 89 

 Puypt, i. 344 



