INDEX 



66] 



Nutrient solutions for plants, 242 

 Nutrition, plant and animal compared. 



167 

 Nucleus, 130, 456, 465 



Obelia, 81, 414 



life cycle of, 185 

 Ocelli, bee, 203 

 Octopus, 97 

 Odonata, 100 

 Odontoceti, 117 



Odor, perception of, in bees, 204-205 

 Oedogonium, 69 



structure of, 172-173 

 Oenothera, 525 

 Oestrin, 399 

 Oil 



in plants, 264-265 



occurrence of, 479 

 Okapi, 508 

 Olfactory bulbs, 347 

 Olfactory lobes, 347 

 Olfactory nerve, 352 

 Olfactory pits, bee, 205 

 Oligocene period, 476, 511, 513, 554 

 Ommatidia, 205, 206, 358 

 Onychophora, 99, 103 

 Oogenesis, 430 

 Oogonia, 430 



Oedogonium, 172 

 Ookinete, 228 

 Oospore, Oedogonium, 172 

 Operculum, moss, 176 

 Ophioglypha, 95 

 Ophiuroidea, 95 

 Opisthocranium, 563 

 Opsonins, 626 

 Optic chiasma, 352 

 Optic lobes, 350 

 Optic nerve, 352, 358 

 Optic stalks, 350 

 Oral (buccal) cavity, 284 

 Oral groove, Paramecium, 158, 159 

 Orang-utan, 537, 539 

 Orbit, 358 

 Orchard fruits, 574 

 Orchard heaters, 10 

 Ordovician period, 476, 513 

 Organ, 506 



Organ of Corti, 362, 370 

 Organismal theory, 139, 365 

 Organisms 



definition of, 148-149 



shifting of, 34-38 

 Organizers, 432 

 Organogeny, 414 

 Origin of life, 406, 407 

 Ornithorhynchus, 115 

 Orohippus, 511 



Orthogenesis, 527 



Orthoptera, 99 



Osborn, estimate of geological time by, 



553 

 Osborn, Henry F., 407 

 Osborne, 278 

 Oscillatoria, 69 

 Osmosis, 135 



Osmotic pressure, in plants, 135-136 

 Ostia, insect heart, 209 

 Ostium, 302 

 Ostracoderms, 105 

 Ostriches, 113, 545 

 Otocyst, 372 

 Otoliths, 361, 372 

 Outbreeding, 455 

 Ova, 415, 430 

 Ovary, 412, 415 

 Overpopulation, 518, 519 



results of, 34 

 Oviducts 



bee, 212 



earthworm, 196 

 Ovipositor 



bee, 202 



queen bee, 212 

 Ovists, 466 

 Owls, 114 

 Ox botfly, 221, 222 

 Oxidase, 280 

 Oxygen, 318 



production of, by green plants, 269 



release of, by green plants, 269-270 

 Oxyhemoglobin, 303, 312, 316, 317 

 Oysters, 97, 103 



Pack, C. L., 581 



Paedogenesis, 414 



Pain receptors, 363 



Palatine ridges, 284 



Palatine tonsils, 287 



Paleocene period, 476, 513 



Paleolithic division of Stone age, 547, 



560 

 Paleontology, 473, 482 

 Paleotherium, 511 

 Paleozoic era, 476, 478, 513, 553 

 Paleozoic period, 512, 513 

 Pallium, 348 

 Palolo worm, 411 

 Pancreas, 293, 295, 396 

 Pangenes, 522 

 Pangenesis, 522, 526. 527 

 Papillary muscles, 308 

 Pappataci, 620 

 Parahippus, 511 

 Paramecium, 77, 157-163, 316 



locomotion of, 159-160 



structure of, 159 



