684 



INDEX 



Nerves, 104-107; 105 



afferent (sensory), 116; 117 



autonomic, 107, 118-120 



cervical sympathetic, 95 



efferent (motor), 116; 117 



spinal, 104-107; 105, 117-119 



vagus, 70, 95, 104, 121 

 Nervous mechanism and brain, 115-124 

 Nervous system, 26, 103-134 



autonomic, 107, 118-120 



central, 104; 105, 106 



in Metazoa, 191-192; 181-183, 185 



peripheral, 104; 105 



sympathetic and parasympathetic, 120 

 Neural plate and tube, 237-239; 234 

 Neuromotor apparatus, 190 

 Neuron, 107; 116-124; 20 



adjuster, 116; 111, 117, 118 



afferent (sensory), 116; 117, 118 



efferent (motor), 116; 117, 118 



pre- and postganglionic, 119 

 Niacin, 61 

 Night blindness, 58, 59 



inheritance of, 292 

 Nilotic Negro subrace, 523; 512 

 Nitrifying and nitrogen-fixing bacteria, 



199-201, 570 

 Nitrogenous wastes, 78-80, 189-190 

 Node, 152; 153 

 Nomenclature, binomial, 374 

 Nordic race, 509, 516; 512 

 Nose, human, 482, 513; 494, 496 

 Nose form, inheritance of, 324 

 Notochord, 237, 362, 655; 185, 238, 594 

 Nuclei, 16; 18, 136 



antipodal, 271; 270 



generative, 269; 270 



meiotic division of, 215-219 



mitotic division of, 17-22 



sperm, 269; 270 



tube, 269; 270 

 Nucleolus, 16; 18, 136 

 Nucleoproteins, 400 

 Nutrition, human, 55-64 



in plants, 137-139 



O 



Occiput, 32; 31 

 Oil glands, 51; 50 

 Old Stone Age, 531-533; 530 

 Ontogeny, 365 

 Onychophora, 627, 630, 648 

 Oocytes, oogonia, 220-221 

 Oogenesis, 219-221 

 Optimum, 553-554 

 Orangutan, 479; 480, 481, 485 

 Orchids, 606, 624; 273 



Order, 3, 374, 377, 596; 375 

 Ordovician period, 395, 421 

 Organ of Corti, 114 

 Organ-system level, 182-184; 185 

 Organization, of human body, 11-26 



of individual plant, 134-141 



levels of, in animals, 178-192 

 in plants, 192-204 

 Organs, 12, 23 



of sense, 109-115 

 Origin of Species, Darwin, 340-342 

 Origin, of muscle, 41; 45 



place or center of, 381 

 Ornithischian dinosaurs, 450-453; 449 

 Ornithopod dinosaurs, 452; 451 

 Orthogenesis, 344, 506 

 Osmosis and osmotic pressure, 13, 148- 



150 

 Ostracoderms, 421-425, 630, 657; 594 

 Otolithic membrane, 115 

 Ovary, in animals, 215, 219, 221-223 



human, 242-243; 127 



in seed plants, 264, 269; 263, 270 

 Overpopulation, consequences of, 568, 



591 

 Oviduct, 243-244; 185 

 Oviparity, 227-228; 230 

 Ovoviviparity, 228-229 

 Ovulation, 243 



Ovule, 264, 269; 263, 270, 618 

 Ovum (see Egg) 



Oxidation, 73, 130, 542-545; 25 

 Oxygen, and CO2 exchange, 73-77, 171- 

 172 



and hemoglobin, 76 



and photosynthesis, 169-172, 542-543 



and release of energy, 542-543 

 Oxyhemoglobin, 76 

 Oxytocin (pitocin), 129 



Pi generation, 283 



Pachytene, 218; 217 



Pain, 109 



Palate, 447, 457, 459; 75 



Paleolithic cultural era, 531-533; 530 



Paleolithic peoples, 532-533, 536, 537 



Paleozoic era, 395, 404 



life of, 404-413, 419-438, 458-459 

 Pancreas, 70; 69, 127, 185 



enzymes of, 68, 70, 133 



and insulin, 131-132 

 Papuan subrace, 524; 525 

 Parallelism, embryonic, 361-365 

 Paramecium, 212, 632 

 Parapsid reptiles, 440, 441, 631; 442, 



443 



