474 



INDEX 



Pancreas, 159, 160, 205, 24J, 244, 271, 



273 

 Pancreatic juice, 163 

 Paramcecium, 64-73, 98, 99 

 Paramoecium bursaria, 72, 73 

 Paramaecium catidatum, 64, 6^, g8, 99 

 Parasites, 73, 76, 81, 83, 97, 99, 103, 



106, 363-365 

 Parasitism, 53, 73, 413 

 Parathyroid glands, 204, 206, 271, 2y^ 

 Parthenogenesis, 263 

 Parthenogonidium, 89 

 Passenger pigeon, 399 

 Passive defense, 354 

 Pasteur, 87, 424 

 Pasteurize, 87 

 Pathogenic, 74, 82 

 Pelecypoda, iio, iii 

 Pelvic girdle, 151 

 Pepsin, 162, 163 

 Peptones, 43, 162 

 Perch, 117, 169 

 Pericardial cavity, 136, lyS 

 Perilymph, 231 

 Periosteum, 152 

 Peripatus, //j 



Peripheral nervous system, 215, 216 

 Perisarc, 259 

 Peristalsis, 161 

 Peritoneal cavity, 136, 137 

 Permeability, 32 

 Personality, 208 

 Pessulus, 349 

 Ph ago cat a gracilis, 296 

 Phagocyte, 83, 174 

 Phagocytosis, 83 



Pharyngeal pouches. See Visceral pouches. 

 Phenotypes, 323 

 Photogenin, 356 

 Photophelein, 356 

 Photosynthesis, 41, 42, 73 

 Phototropism, 372, 373 

 Phyla, 96 



Phylogenetic relationships, 124 

 Phylogenetic tree, 124, 12$ 

 Phylogeny, 124 

 Physics, 2, 6, 418, 425 

 Physiology, 32, 39, 52, 416, 425 



Physiology, cell, 32 



Pineal gland, 204, 206, 219 



Pisces, 117, 118, 125 



Pistil, 255, 257 



Pithecanthropus erectiis, 405 



Pituitary gland, 204, 218, 219, 271 



Placenta, 276, 27J, 278, 279, 280 



Placoid scale, 144 



Plain muscle, 241 



Planaria, 104, 106, 248, 296, 297, 413 



Planaria dorotocephala, 248, 249 



Planaria velata, 247, 249 



Plant cell, ^g, 40, 41, 42 



Plant kingdom, 46, 76, 77, 95 



Plant nutrition, 42, 153 



Planula, 260, 261 



Plasma, 174 



Plasma membrane, 30, 32, 34, 36 



Plasmodium, 74, y^, g8, 99 



Plastids, 38, S9 



Plastron, turtle, 144 



Platinum sponge, 78 



Platygaster vernalis, 262 



Platyhelminthes, 103, 104, 10^, 106, 125, 

 136, 138, 166, 173, 247, 248, 249, 

 262, 263, 273, 295, 364, 413 



Pleural cavity, 136, 1J7 



Plicae, 158, 161 



Poikiliothermal animals, 191, 374 



Polar bodies, ji6, 317 



Pollen, 2^6, 257 



Polocytes, 317 



Polycirrus, 365, 413 



Pol ye don spattda, 414 



Polyembrony, 262 



Polyhybrids, 326 



Pope, 426 



Porifera, 99, 100, 125, 131, 134, 143, 

 166, 209, 247, 295, 401 



Posterior, 1^4, 135 



Potassium nitrate, 42, 44 



Potassium nitrite, 42, 44 



Potato beetle, S43 



Potential energy, 17, 41, 45 



Preformation, 345 



Pre-natal influence, 278, 279 



Presbyopia, 227 



Pressure gradients, 379 



