718 - Index 



Psychology, 14, 467 



Pterodactyls, 671 



Pleropsida, 615-21 



Pterosaurs. 568 



Ptyalin, 109, 301 



Puberty, 388, 400 



Puccina graminis (si e Wheat rust) 



Puffballs, 173, 606, 607 



Pulvinus, 260 



Punnctt Square, 183. 488 



Purines, 89, 137. 353 



Putrefaction, saprophytic bacteria and, 177 



Pyramidal tract, 464-65 



Pyridoxine, 348, 352 



Pyrimidine bases, 137 



Pyrimidines, 89 



Pyrrophytes (flame fungi), 598-99 



Pyruvic acid, 145 



Pyruvic transaminase, 102 



Q 



Quaternary period. 559, 563, 565, 569 

 Quillworts, 613 



R 



Rabinowitch, E. J., 161 



Radiant energy, 66, 161 



Radioactive carbon. 161, 164, 165 



Radioactive isotopes, 35. 47, 255 



Radioautograph, 255 



Radiolaria, 625 



Rasmussen, H., 405 



Ray flowers, 225. 227 



Reabsorption, 374-76 



Reaction foci, 95 



Reactions, animation 153; anaerobic 436; dark, 

 160, 163-64; deamin.ition, 138; decarboxylation, 

 152; decomposition, 78; endothermic, 78: 

 exothermic, 78, 107; hydrolytic, 138-39: light, 

 160; metabolic, of animal cells. 133-39; oxida- 

 tion-reduction, 1-15: peroxide. 99; photochem- 

 ical, 161, 266: sympathetic. 78 



Recapitulation, theory of. 557 



Reception, mechanisms of, basic, 427-29 



Receptor pigment. 266 



Receptors. 194, 195, 419-29; cutaneous, 419-20; 

 equilibrium, 424-25; light, 421-24; mechanism 

 of reception and transmission. 427-29; pain. 

 420; sensations, perception of. 126-27; sense 

 organs, 419-26; smell. 420-21; visceral, 426 



Recombinations, 513 



Recovery metabolism, 193 



Rectum, 311, 315, 387 



Red algae (see Algae) 



Red corpuscles. 20. 289-90, 320-21 



Recli, F,, 186 



Reduction, 144 



Reed, 8 



Reflex arc, 452-53; synapses and other relay 

 points in, 453-54 



Reflexes, breathing, 367: conditioned. 458. 460. 

 468-69; gastrocolic. 315: salivation, 301-03; 

 somatic, 460; suprasegmental, 462; uncondi- 

 tioned, 468; visceral. 465-67 



Refractory period, 193 



Regeneration, 396 



Reindeer moss. 607, 610 



Relaxin, 113 



Renal impairments, 376 



Rennin, 306 



Reproduction, 4, 5; asexual. 55-57, 203. 393-96, 

 499-501; cell division in relation to. 40-62; 

 female reproductive organs of man. 386-88; 

 fertilization, external vs. internal. 381-83, 388; 

 male reproductive tract of man, 383-86; in 

 multicellular animals, 380-96; in multicellular 

 plants, 203-34; nutrition of the embryo. 388- 

 93; organs of, 380-81; sexual, 57-60, 203: in 

 simpler organisms. 55-60; vegetative methods 

 of. 234; of viruses, 8, 11 



Reproductive tract of man, female, 386-88; male, 

 383-86 



Reptiles, 566, 567. 568, 667, 671-72 



Respiration, 128, 132-33. 357-68; asphyxia, 

 366-67; breathing, control ol. 367-68; carbon 

 dioxide-carrying capacity of blood. 364-66; 

 external. 357-63; internal, 357, 364: oxygen- 

 carrying capacity of blood, 363-64; in plants, 

 170, 255-56; stem, 241 



Responses, of higher animals. 419-29, 431-45; 

 discontinuous. 167: discontinuous vs. continu- 

 ous, 189; growth movements. 259. 261-67; local- 

 ization of, 457; of multicellular organisms, 200; 

 of multicellular plants, 259-67; nervous system 

 of higher animals, 447-70; turgor movements, 

 259-61 



Responsive mechanisms in one-cell organisms. 

 191-98 



Responsiveness, 4; in single cells, 189-200 



Resting potential. 191, 192-93 



Retinene, 423 



Rh factor, 325-26 



Rhizoids, 175, 205. 212. 236-37, 238, 240-41 



Rhizome, 612. 61 7 



Rhizopus, 175. 210, 211 



Rhodophytes (reel algae), 600-01 



Rhodopsin, 350, 423 " 



Rhodymenia, 601 



R It y nchocephalia, 671 



Ribbon worms, 64 1 



Riboflavin, 101, 116. 348. 352 



