580 



INDEX 



Pancreatic juice, 83; control of secre- 

 tion of, 97. 



Pandorina, 198, 199, 215, 216. 



Parayncecium, behavior of, 179, 181; 

 classification of, 189; fluctuations 

 in, 559; life cycle of, 184; metab- 

 olism of, 183; movements and 

 locomotion of, 178; neuromotor 

 system of, 182, 183; reproduction 

 of, 184; structure of, 175, 177. 



Parapodium, 312, 313. 



Parasites, 206, 211, 259; of crayfish, 

 329; of frog, 22; of locust, 350, 

 351, 352. 



Parazoa, classification of, 239, 240; 

 internal organization of, 245. 



Parthenogenesis, 220, 235. 



Parthenogonidium, 201. 



Pasteur, 204. 



Pathology, 3, 130. 



Pearl, 459. 



Pearson, 459. 



Pectinaria, 314. 



Pelecypoda, 241. 



Pellicle, see Cuticle. 



Pelopceus, 389. 



Penis, in locust, 347, 358. 



Pentilia misella, 551. 



Pepsin, 82. 



Peranema, 155, 175. 



Pereiopods, 323, 327, 332. 



Pericardial sinus, 356. 



Pericardium, 48. 



Peripatus, 339. 



Peripheral nervous system, see 

 Nervous system. 



Peristalsis, 83, 84. 



Peristomium, 283, 312. 



Peritoneum, 40, 291, 300; parietal, 

 48, 417; visceral, 48, 417. 



Peritricha, 190. 



Phacus, 155. 



Phagocytosis, 211. 



Pharynx, of earthworm, 290, 292. 



Phascolosoma, 310. 



Phillipsia griffithides, 503. 



Phoronida, 241. 



Photosynthesis, 170. 



Phototropism or phototaxis, 181, 264, 

 304. 



Phyllopoda, 334, 336. 



Phylogeny, 506. 



Phylum, 11, 14, 237. 



Physalia, 277, 278. 



Phj'sical sciences, 1. 



Physiology, 2, 3, 4, 5, 6; as evidence 

 for evolution, 522; of vertebrate 

 animals, 71, 106. 



Physiological balance, 105. 



Physopoda, 374. 



Phytomastigina, 155, 174, 215. 



Pickerel frog, 12, 16. 



Pig, evolution of, 524. 



Pineal body, 65, 98. 



Pisces, 37, 241. 



Pithecanthropus erectus, 533. 



Pituitary gland, 66, 101. 



Pituitrin, 101. 



Placenta, 433, 452, 453. 



Placobdella, 310. 



Planaria, 452. 



Plant Kingdom, 14, 240. 



Planula, 275. 



Plasmodium malaria', 207, 208. 



Iiatyptera, 373. 



Platyhelminthes, 246, 452; classifica- 

 tion of, 237, 240, 241. 



Platypus, 29. 



Plecoptera, 373, 377. 



Pleodorina, 199, 215, 216. 



Pleurobrachia, 281. 



Pleuronectes, 498. 



Pneumonoeces, 22. 



Podophrya, 154, 176, 190. 



Polar bodies, 229, 272, 307, 403, 403. 



Polistes, 390. 



Polychffita, 310, 311. 



Polygordius, 310. 



Polymitarcys, 378. 



Polyp, 237, 274, 277, 280. 



Polyspermy, 232. 



Polyzoa. 238, 241. 



Population, 461. 



Porifera, classification of, 237, 240, 

 241; sensory-neuromuscular sys- 

 tem of, 316. 



