528 



INDEX 



Organ-forming substance, 277-279 

 Organic adaptation, 316-337 

 Organic evolution, See: Evolution 

 Organism, 14, 18, 29 

 Organization, 18-20 

 Origin, of life, 218-228; of germ cells, 



238-250; of species, 349-385, 471- 



476 

 Ornithology, 124 

 Ornithorhynchus, 127 

 Orohippus, 362, 363 

 Orthoptera, 94 

 Osborn's theory, 226, 227 

 Osculum, 70 

 Osmosis, 16, 157, 505 

 Osteology, 139; See: Skeleton 

 Ostium, 68, 70, 76 

 Ostrich, 124 

 Otter, 323 

 Outer ear, 213 



Ovary, 99, 101, 102, 188-195, 238, 239 

 Oviduct, 102, 184, 189-195 

 Oviparous, 123 

 Owen, 458, 459 

 Owl, 325 

 Ox, 355 



Ox botfly, 405, 406 

 Oxidation, 23, 24, 42, 165, 166, 197 

 Oxygen, 165, 166, 463 

 Oxyhemoglobin, 166 

 Oyster, 88, 89, 236, 306 



Pain sense spots, 211 



Paleolithic, art, 437, 440, 441; cul- 

 ture, 438-441; man, 433-441 



Paleontology, 4, 358-364, 368 



Paleozoic era, 359-361 



Panama Canal, 394 



Pancreas, 133, 146-148, 152, 154, 155, 

 171, 196, 197 



Pancreatic juice, 155 



Paralysis, 394 



Paramecium, 53-56, 199, 229, 230, 

 235, 255-260, 477; behavior, 344- 

 346; conjugation, 55, 230, 255-260; 

 endomixis, 55, 258, 259; heredity 

 284; irritability, 544-346; repro- 

 duction, 56, 256, 375; species, 54; 

 structure and life history, 53-55 



Parasite, 51, 53, 79, 220, 234, 339- 

 343, 396-401, 407 



Parazoa, 480 



Parrot, 126 



Parthenogenesis, 234, 255, 260, 261; 



artificial, 260, 261 

 Pasteur, 221, 389, 390, 414, 454, 455 

 Patella, 142, 144 

 Pathology, 4 



Pea, inheritance, 288-297 

 Peach, 416 

 Pear, 416 

 Pearl, 89, 90 

 Pebrine, 414 

 Pecten, 331, 333, 334 

 Pectoral girdle, 142-144 

 Pedicellaria, 84 



Pedigreed race of Paramecium, 258 

 Peking man, 433, 438 

 Pelecypoda, 87, 88 

 Pellagra, 159 



Pelvic girdle, 142-144, 323 

 Penguin, 126 

 Penis 148 194 



Pentadactyl limb, 140-144, 321 

 Pepsin, 153, 156 

 Peptone, 156 

 Peranema, 51 

 Perch, 113, 146\ 

 Pericardial cavity, 133 

 Pericardium, 133, 148 

 Periosteum, 135 

 Peripatus, 97, 478 

 Perisarc, 72 

 Peristalsis, 153, 156 

 Peristome, 55 

 Peritoneum, 64, 134 

 Perspiration, 178, 181, 183, 198 

 Petromyzon, 113 

 Peyer's patches, 342 

 Pfliiger's theory, 224, 225 

 Phacus, 51 

 Phagocyte, 342 

 Phalanges, 142-144, 355 

 Pharynx, 102, 110, 132, 133, 151. 152, 



358 

 Phenotype, 291-296, 382 

 Philosophy, 5, 385, 447 

 Phosphorescence, 51 

 Photosynthesis, 32, 33 50, 317, 337, 



338, 403, 463 

 Phylogeny. 366, 480 

 Phylum, 47, 353, 477-480 

 Physalia, 73 

 Physical basis of life, 14-29, 465; See: 



Protoplasm 

 Physics, 1, 2, 5. 460, 464 



