716 - Index 



Parathyroid glands, 398, 403, 405-06 



Parotid glands, 300, 301 



Parthenogenesis, 276-77 



Parthenogonidia, 276 



Passive transport mechanism, 113-21; active vs., 

 112-13; diffusion, 113-15; hypertonic solutions, 

 120-21; hypotonic solutions, 118-20; isotonic 

 solutions, 118; osmosis, 115-16, 118-21; perme- 

 ability of the plasma membrane, 116-17 



Pasteur, L., 8, 186 



Pavlov, I. P., 302, 307, 469 



Pediculus vestimenti, 578 



Pclecypoda, 653 



Pellagra, 352 



Pellicle. 33 



Pendular movements, 314 



Penicillin, 176, 604, 606 



Penis, 381, 384, 385 



Pentane, organic compound, 77 



Pepsin, 102,104, 109, 130. 306 



Peptidases. 314 



Peptide bond, 85, 86, 87 



Peptide chain, 85, 86 



Peptides, 306 



Pericardial cavity, 318 



Pericardium, 285 



Pericycle, 230, 245, 246 



Peripatus, 654, 655, 656 



Peripheral nervous system, 451-52 



Peritoneum, 285 



Permanent colony. 56 



Permian period, 563, 565 



Peroxidase, 106 



Peroxide reaction, 99 



Petroleum, 598 



PGA (see Phosphoglyceric acid) 



Phaeophytes (brown algae), 599-600 



Phagocytosis, 30. 121-22, 197. 322 



Pharyngeal pouch. 294 



Pharynx, 294. 295, 296, 297, 303 



Phase reversal, 93-94 



Phenol red dye, 31 



Phenotype, genotype vs., 484-87 



Phenylalanine. 135, 136, 306. 312 



Phenylketonuria, 505, 506, 529 



Phloem, 243, 247, 248, 250, 609, 611 



Phlogiston hypothesis, 13 



Phosphate bonds, high-energy, 143 



Phosphate compounds, high-energy, 143-44 



Phosphate molecules, high-energy, 143 



Phosphoglyceric acid (PGA), 165, 166 



Phospholipids, 82-83, 137 



Phosphorolysis, 152 



Phosphorylation, 149-50 



Photochemical decomposition, 162 



Photochemical reactions, 161; reversible, 266 



Photochemistry, 161 



Photolysis, 161; of water. 162 



Photons, 161 



Photoperiodicity, 584 



Photoperiodism, 265-67 



Photophosphorylation, 162, 163 



Photoreceptors, 195. 421, 423 



Photosynthesis, 28, 78, 158, 238, 243; mechanism 

 of, 158-67 



Phototropism, 263 



pH scale, 74 



Phycocyanin, 159. 595 



Phycoerythrin, 159. 600 



Phycomycetes (algaelike fungi), 604 



Phylum, taxonimic category, 593 



Physical structure of protoplasm, 90-95; adsorp- 

 tion, 93; coarse dimension, 91-92; colloidal 

 dimension, 91-92; crystalloidal dimension, 91- 

 92; dispersions, diphasic and multiphasic, 93; 

 emulsifying agents, 93; emulsions, 93; gelation, 

 94—95; molecular polarity, 92; particles, size and 

 mobility of, 92; phase reversal, 93-94; proto- 

 plasmic surfaces, 95; solation, 94—95; solutions, 

 92: suspensions, 93 



Physiology, 14 



Photochrome, 266-67 



Phytohormones, 262-63, 265 



Phytol, 159 



Phytoplankton. 589 



Pigment granules. 30 



Pigmentary effectors. 431. 443-45 



Pineal gland, 398, 412, 413-14 



Pinocytosis, 30, 121-22 



Pith. 243, 247, 248 



Pithecanthropus, 571 



Pituitary giant, 410 



Pituitary gland. 398, 409-13; deficiency and over- 

 dosage experiments. 410; hormones of the an- 

 terior lobe, 410-12; hormones of the posterior 

 lobe, 412; secretion ol, control ol, 412-13 



Placenta, 390-93, 413 



Placental mammals, 674-76 



Placentates. 393 



Planaria, 55, 296, 318, 370. 635. 637; saccular 

 digestive systems of, 292-95 



Planetary electrons, 70 



Plankton. 589 



Plant hormones, 265 



Plant inhibitors, 265 



Plant kingdom. 592-621; animal kingdom and. 

 592-94; Embryophy ta, 609-21; outline of, 594; 

 taxonomic categories, 593-94; Thallophyta, 

 594-609 



Plants (see Green plants; Multicellular plants; 

 Plant kingdom; Seed plants; Vascular plants) 



Plasma. 289, 320, 374: nephric filtrate compared 

 to. 374 



Plasma cells. 337 



