Index 



501 



Parry, 36 



Parthenogenesis, 479 

 artificial, 328-9 

 see Sex cycle, Summer eggs 



Partula, see Tahiti 



Pasteur, 440, 480 



Pavlov, 88 



Peacock, extinct, 148; see Sexual 

 selection 



Pearl, 237, 251-2, 294 



I'eary, 54 



Peas, see Inheritance, Nitrogen 

 fixation 



Peck, 372 



Peebles, 194 



Pellagra, cause, 293, 476; symp- 

 toms, 293 



Penikese, see Agassiz, L. 



Pennsylvania University, 50, 84 



Pennsylvanian period, reptiles, 125 



Peridinium, shell, ill. 92 



Period, see Cambrian, Carbonifer- 

 ous, Devonian, Huronian, 

 Laurentian, Ordovieian, 



Pennsylvanian, Permian, 



Silurian, Trlasslc 



Permian period, climate, earth 

 changes, 125 



Peromyscus, see Mice, deer 



Perroncito, 465 



Persimmon, 415 



Pheasant, see Ring-necked 



Philadelphia, scientific center, 50, 

 53 

 zoological garden, see Zoological 



Philippines, see I'lague Control 



Phipps, Institute, 86 



Phororachis, 135 



Phosphorescence, see Animals, 

 oxygen 



Photometer, see Light apparatus 



Photosynthesis, 81 



Phytolacca, see Poke-weed 



" Phytogeography of Nebraska," 

 158 



Pickerel, see Devils Lake 



Pierida;., see Mimicry 



Pigeon, mating reactions, 314-5 



Pigment, 332-3; bile, 334 



Pika, distribution, 168, 174 



Pilobolus, spore discharge, 307 



Pine Barrens, see New Jersey 



Pine, see Fox-tail, Limber, Piiiou, 

 Yellow 



Piuon pine, distribution, 176 



Pipit, distribution, 168 



Pistache tree, ill. 415 



Pituitary, influence on growth, 321 

 see Vertebrates, hypophysis 



Pituitrin, see Biological remedies 

 Placoid scale, 134 

 Plaice, migration, 360 

 Plague, bubonic, bacillus, 458 

 control, 460-1 

 and fleas, 457-8 

 ground squirrels, 460-1 

 history, 457 

 and rats, 457-61 

 and woodchi'.cks, 461 

 see Mouse ; Rat, parasites 

 Plankton, collection, 370 ct seq. 

 counting, 375-7 

 l)ulses, 383 

 relation to other organisms, 372- 



373 

 see Illinois River 

 Plantain weed, see Sex intergrades 

 Plant Industry, see U. S. Bureau 

 Plants, alternation of generations, 

 100-1 

 aquatic, overwintering, 382 

 compared with animals, 297 

 dispersal, 157-8 

 distribution, 164, et seq. 

 interrelation with aninuUs, 161; 



With plants, 160 

 introduction, 412, et seq. 

 reactions, 307-11 

 regeneration, 193 

 societies, 158, 160 

 stems, unequal growth, ill. 310-1 

 succession, 158-60 

 see Circulation; Conduction; 

 Pools, temporary 

 Plastic Surgery, 197; ill. 198 

 Plato, 269 

 I'lelstocene epoch, climate and 



mamnuils, 143, 174 

 Pleuroi)neumonia, cattle, inocula- 

 tion, 447 

 Pliny, 192, 320, 402 

 Pliocene epoch, migration of mam- 

 mals, 174 

 Plunmge laws, 422 

 Pocket gopher, destruction, 400, 

 402 

 ill. 402 

 Poke-weed, influence of environ- 

 ment, 222 

 Polar bear, color, 338 

 distribution, 172 

 1raiisj)ort, 155 

 ill. 169 

 Pollen, 331 ; see Flowers, reproduc- 



t ion 

 i'olychu'ta, alternation of genera- 

 tions, 100-1 

 Polydactylism, see Man 



