502 



Index 



Polyphemus moth, grafting, 196 

 Polyzoa, alternation of genera- 

 tions, 101 

 Pomeroy family, inheritance, 273- 



274 

 Pools, temporary, life of, 381-3 

 Porcupine, distribution, 174-5 

 Porthesia, response to light, 313- 



314 

 Portuguese man of war, 358 ; ill. 



357 

 Potato bug, see Beetles 

 Pound, 158 

 Powers, 223, 224 



Prairie dog, 182; destruction, 400, 

 402 

 ill., 181 

 Preformation, 189 

 Pribilof, 431 

 Priestley, 283 

 Princeton College, 49 

 Principle, see Vital 

 Promethea moth, grafting, 19G 

 Protective color, see Color 

 Proteid, digestion, energy produc- 

 tion, 296 

 see Diet 

 Prothallus, see Ferns, reproduction 

 Protoplasm, 296-7 

 analysis, 278 

 chemistry, 207 

 composition, 480 

 structure, 480 

 Protophyta, 89; specialization, 94, 

 95 

 reproduction, 95, et seq. 

 Protococcaeeae, 95 

 Protozoa, 89 ; alternation of gen- 

 erations, 101-3 

 colonial, 95 



compared with Metazoa, 201 

 conjugation, 96 

 fertilization, 96 

 immortality, 200 

 interrelation, 93-4 

 mode of life, 92-3 

 primitive type, 95 

 nervous system, 306-7 

 nucleus, 480 

 organs, 92 



oxygen requirement, 380 

 related to disease, 440 

 reproduction, 95, 96, 103 

 shells, 92 



specialization, 90-4 

 ill. 90-1 



see Amoeba, Paramcecium, etc. 

 Ptarmigan, distribution, color, 168 

 ill. 166-7 



Pteranodon, 130 



Pterodactyls, resemblance to birds, 



130-1 

 structure, 129-31 

 Pteropod, 352; ooze, 353 

 Ptolemies, marriage customs, 85 

 Puberty, 325 

 Public Health Laboratory, N. D., 



381 

 Puerperal fever, 444 

 Puma, distribution, 176 



transport, 155 

 Puunett, 88 

 Pure lines, selection, 236-7, 242- 



243 

 ill. 237 

 Ptyalin, 279 

 Pyramid, see Lake 



E 



Rabbit, damage, 396 

 cottontail, ill. 397 

 jack, damage, destruction, 402 

 Porto Santo, 222-3 

 see Inheritance, Eecognition 

 marks, Snowshoe 

 Rabies, spread by wolf and coyote, 



399 

 Raccoon, distribution, 176 

 Race, see Species 

 Radiolaria, 360; fossils, 117 

 ooze, shells, 92 

 ill. 352 

 Radium, see Cancer, Evening prim- 

 rose 

 Rafinesque, meets Audubon, 28 

 career, 30-1 

 description, 28-30 

 evolution, 30 

 fossil jellyfish, 30 

 ill. 29 

 Rana, see Frog 

 Rand, 194 



Ranunculus, see Crowfoot 

 Rat, colony, see Wistar 

 damage, 396-8 

 diet, 292 

 growth, 84 

 inbreeding, 85 

 introduction, 387 

 nervous system, 84 

 parasites, 387 

 sex determination, 209 

 spread, 153-5, 387 

 ill. 399 



see Cotton, Hawks, Hooded, 

 Kangaroo, Owls, Plague, 

 Rice 



