3 6 4 



INDEX 



Paramecium, 66, 340; infusoria in gen- 

 eral, 124; Hydra, 216; relation to reac- 

 tion to light in Paramecium bursaria, 142; 

 general, 340. 

 Oxytricha, avoiding reaction, 114; sponta- 

 neous collections, 122; reaction to heat 

 and cold, 125; transverse position in 

 electric current, 154. 



Pain, 332, 340. 



Paramecium, structure, 41; movements, 44; 



behavior and reactions, 44-109; relation 



of behavior to reflexes, 279; relation to 



consciousness, 336. 

 Paramecium bursaria, reaction to light, 142, 



340; to gravity, 149- 

 Parasitic infusoria, reaction to light, 142, 333. 

 Parker, reversal of cilia in sea anemones, 



224; reaction of separate parts, 227; 



conduction of stimulation, 229. 

 Parker and Arkin, behavior of earthworm, 248. 

 Pawlow, modifiability of action in digestive 



glands, 347. 

 Pearl, reaction to electric current, Chilomo- 



nas, 152; Colpidium, 155; Hydra, 208; 



cause of reaction to electric current, 165; 



behavior of Planaria, 236, 243, 245, 253, 



273- 



Pedicellariae, 234; behavior, 235, 238. 



Pelomyxa, reaction to light, n. 



Penard, movements of Amoeba, 6, 8. 



Perception, 329. 



Perichoeta, reaction to light, 248. 



Peridinium, reaction to electric current, 152. 



Perkins, behavior of Gonionemus, 192. 



Pfeffer, behavior of bacteria, 32, 33, 34, 38; 

 of fern spermatozoids and flagellates, 

 123, 124; tropisms, 275; nomenclature, 



275- 



Physiological states, dependence of behav- 

 ior on, Stentor, 178; ccelenterates, 229, 

 231; invertebrates in general, 251; flat- 

 worm, 253; Protozoa and Metazoa, 263; 

 higher animals and man, 331; relation to 

 reflexes, 282 ; changes of physiological 

 state, 287; law of change, 291; develop- 

 ment in physiological states, 316; gen- 

 eral, 286-291. 



Planaria, localization of reaction, 236; test- 

 ing movements, 243; righting reaction, 

 245; physiological states, 233; relation 

 to tropism theory, 273. 



Plasmolysis, 34. 



Pleasure, 332, 340. 



Pleuronema, reaction method, 115; reaction 

 to light, 142. 



Poisons, collection of bacteria in, ^^. 



Polarizing effect of electric current, 167. 



Polyorchis, reaction to electric current, 210. 



Polytoma, reaction to chemicals, 123; to 

 gravity, 149. 



Polytomella, reaction to electric current, 152. 



Positive reaction, in Amoeba, 8, 23; bacteria, 

 28; Paramecium, 54, 60, 65; in other 

 infusoria, 121; general, 295, 309. 



Preyer, behavior of starfish, 239; habit for- 

 mation in starfish, 241 ; varied physio- 

 logical states, 253. 



Prism, Strasburger's experiments with, 145. 



Protozoa, behavior, 1-187; reflexes in, 233; 

 relation to tropism theory, 269-271; 

 comparison with behavior of Metazoa, 

 260-264. 



Pseudopodia, 1, 4; reaction of single one, 15. 



Psychic behavior, relation to behavior of 

 lower organisms, 329. 



Purpose, 343. 



Putter, interference of heat and contact reac- 

 tions, 93; of contact and reaction to elec- 

 tricity, 119; variability of contact reac- 

 tion, 100; symptomatology, 300. 



Quieting infusoria, 81, 83. 



Radl, reaction to gravity, 77; theory of 

 tropisms in reaction to light, 274. 



Random movements, 251, 254 (see trial move- 

 ments). 



Reaction, 6, 283. 



Reflexes, 232; in Protozoa and Ccelente- 

 rata, 233; in sea urchin, 234, 235; in star- 

 fish, 236; in flatworm, 236, 254; in higher 

 animals, 237; relation to modifiability, 

 258; definition, 277; part played in be- 

 havior of lower animals, 277-282. 



Regeneration, variation in processes, 348. 



Regulation, 299, 301 ; how brought about in be- 

 havior, 338-350; in other fields, 345; in 

 chemical processes, 346; in growth, 348; 

 non-regulatory behavior, 345 (see adap- 

 th'cness). 



Rejecting reaction of sea anemones, 202. 



Rejection of unsuitable food, in infusoria, 

 183; in sea anemones, 202. 



Representative stimuli, 296, 316, 333. 



"Republic of reflexes," 235. 



Resolution of physiological states, law of, 

 291, 314, 334; part played in regulation, 



343- 



Respiration, relation of habits to, in Parame- 

 cium bursaria, 142, 340; in Hydra, 216. 



Reversal of reactions, as stimulus becomes 

 stronger, 262 (see optimum); reversal of 

 cilia in sea anemones, 224. 



Rhumbler, currents in Amceba, 4, 5 ; reac- 

 tions of Amoeba to food, n, 19, 20, 25. 



Rhythmical contractions, in Yorticella, 1S1 ; in 

 Hydra, 189; in medusa, 191; in margins 

 and bell of medusae when separated, 227; 

 rhythmical activity of Convoluta as habit, 



255- 

 Righting reaction, in Hydra, 193; in sea 

 anemones, 195; in starfish, 239; in flat- 

 worm, 245. 



