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INDEX 



459 



Nacreous layer, 159 

 Narwhal, 418 

 Nauplius, 152 

 Nautiloids, 193 

 Nautilus, 191 

 Nebular hypothesis, 293 

 Nemathelminthes, 230, 298 

 Neinatoda, 230 

 Nephridia, 161, 206 

 Nerve control, 207 

 Nerve-cell, motor, 208 ; sensory, 208 

 Nerve-cord, 303 



Nervous system, central, 208 ; periph- 

 eral, 208 

 Nettle-cells, 258 

 Nettling-capsules, 252 

 Newts, 339, 342 

 Nitrogenous waste, 162 

 Notochord, 302 

 Nototrerna, 344 

 Nucleoplasm, 281 

 Nucleus, 211, 281 

 Nudibranch, 186 

 Nymph, 13 



Odonata, 29, 99, 100 



Operculum, 185, 306, 334 



Ophidia, 353 



Ophiuroidea, 251 



Opossums, 409, 410 ; Virginian, 410 



Oral surface, 236 



Orang-utan, 423, 426 



Orders, 97 



Organs, of Bojanus, 161 ; terrifying, 

 42 



Orioles, 389 ; orchard, 395 



Ornithologists, 391 



Orthoceras, 367 



Orthoptera, 24, 99, 100 



OSBORN, PROFESSOR, on Linnaeus and 

 Buffon, 444 ; on Empedocles, 448 



Oscula, 273 



Osmosis, 200 



Osphradium, 184 



Ostia, 257 



Ostrich, African, 374 ; South Ameri- 

 can, 374 



Otocyst, 127 



Otoliths, 310 



Oviduct, 210 



Oviparous, 316 



Owls, 383, 386 ; great horned, 393 



Oxen, 413, 415, 416 



Oxidation, 203 



Oyster, 165 ; -beds, 186 ; -drill, 184 ; 

 -farm, 167 ; fry, 167 ; pearl, 173 



Palate, soft, 401 ; hard, 403 



Paleontologists, 193 



Paleontology, 436 



Paleozoic Time, 346 



Paramcecium, 286 



Parasites, 60 



PARKER, PROFESSOR G. H., on feed- 

 ing habits of sea-anemone, 254 



PARKER and HASWELL, on birds, 

 373 ; on classification, 298 



Parrots, 397 ; gray, 384 



Parthenogenesis, 34 ; artificial, 290 



Partridge, 382 



Passeres, 386 



PASTEUR, 447 



Paunch, 417 



Pearls, formation of, 173 



PECKHAM, DR. and MRS., on the 

 digger-wasp, 70 ; on instinctive 

 acts in wasps, 86 ; on jumping- 

 spiders, 120 



Pedicellarise, 238 



Peduncle, 233 



Pelecypoda, 175, 194 



Pelican, white, 377 



Peptone, 200 



Perch, yellow, 305 



Perching birds, 386 



Pericardial sinus, 133 



Pericardium, 159 



Periwinkle, 185 



Petrels, stormy, 376 



Phagocytes, 85 



Pheasants. 381 



Phyla, 97 



Phylloxera, 34 



Physiological processes, 196 



Physiology, comparative, 431 



Pici, 385 



Pigeons, carrier, 373 ; domestic, 364 ; 

 fantail, 373 ; passenger, 382 ; 

 pouter, 373 ; tumbler, 372, 373 



Pigs, 413 



Pill-bug, 147 



Pinnae, 398 



Pisces, 316 



Platyhelminthes, 229, 298 



Plectoptera, 26, 99, 100 



PLINY. 440 



