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 



Peary, 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, Ordovician, 



Pennsylvanian, Permian, 

 Siluraan, Trlassic 



Permian period, climate, earth 

 changes, 125 



Peromyscus, see Mice, deer 



Perronclto, 465 



Persimmon, 415 



Pheasant, see Ring-necked 



Philadelphia, scientific center, 50, 

 53 



. zoological garden, see Zoological 



Philippines, see Plague Control 



Phipps, Institute, 86 



Phororachis, 135 



Phosphorescence, see Animals, 

 oxygen 



Photometer, see Light apparatus 



Photosynthesis, 81 



Phytolacca, see Poke-weed 



1 ' Phytogeography of Nebraska, ' ' 

 158 



Pickerel, see Devils Lake 



Pieridse, 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, Pinon, 

 Yellow 



Pinon 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 woodchucks, 461 



see Mouse ; Rat, parasites 

 Plankton, collection, 370 et seq. 



counting, 375-7 



pulses, 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 animals, 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 

 Pleistocene epoch, climate and 



mammals, 143, 174 

 Pleuropneumonia, cattle, inocula- 

 tion, 447 



Pliny, 192, 320, 402 

 Pliocene epoch, migration of mam- 

 mals, 174 



Plumage laws, 422 

 Pocket gopher, destruction, 400, 

 402 



ill. 402 



Poke-weed, influence of environ- 

 ment, 222 

 Polar bear, color, 338 



distribution, 172 



transport, 155 



ill. 169 



Pollen, 331; see Flowers, reproduc- 

 tion 



Polychseta, alternation of genera- 

 tions, 100-1 

 Polydactylism, see Man 



