292 



INDEX 



Paramoecium, motor reflex, 15, 73, 



74, 76 



reaction to ultra violet rays, 

 75 



swimming, 72 

 thermotaxis, 58, 75 

 thigmotaxis, 35, 73, 76 

 Parker, G. H., food taking in 



anemones, 150, 151 

 geotaxis of Labidocera, 31 

 phototaxis of Labidocera, 31, 



50; of Vanessa, 55 

 Parrot imitation, 257 

 Patellas, homing, 188 

 Pawlow, J. P., formation of habits 



by stomach, 159 

 Peal, imitation in jungle pheasant, 



254 

 Pearl, R., 163, goniotaxis in 



Planaria, 36 



reactions of Planaria, 53, 147 

 variability in behavior of 



Planaria, 147 

 Pechuel-Losche, E., intelligence of 



baboons, 267, 269 

 Peckham, G. W. and E. G., 216, 

 homing of wasps, 193-196 

 instincts of solitary wasp, 119, 



120, 131, 132 

 intelligence in solitary wasp, 



203, 204 



variability of instinct in soli- 

 tary wasp, 131, 132 

 Perch, intelligence, 220, 221 

 Pf effer, W., chemotaxis of bacteria, 



22 

 chemotaxis of spermatozoids 



of ferns and mosses, 26 

 Pfungst, O., 258 

 Phototaxis, 19-21, 36, 38, 40 ff, 82, 



186, 192 



Photokinesis, 41, 42 

 Pieron, H., intelligence of Cras- 



sius, 221 



intelligence of Triton, 227 

 kinaesthetic reflex, 199 



Pigeon, compensatory motions, 39 



Pike, intelligence, 219 



Planaria, reactions to chemicals, 



28,53 



reactions to light, 41 

 reactions to mechanical stimu- 

 lation, 53, 141 



reactions to repeated stimula- 

 tion, 141 

 thigmotaxis, 36 

 varied response to stimuli, 



144, 147 



Plants, reactions, 15 

 Play instinct, 109 

 Pleasure, 6, 55, 164 ff 

 Pleurosigma, tidal rhythms, 156 

 Polistes, intelligence, 195, 196 

 Polyergus, stupidity, 210, 211 



variation in cocoon spinning, 



132, 133 



Polytoma, lack of chemotaxis, 25 

 Pouchet, G., phototaxis of Temora, 



50 



Preyer, W., 163, behavior of star- 

 fish, 181 

 human instincts, 100 



Promethus moth, instincts of, 124, 



125 



Protozoa, internally initiated activ- 

 ity, 109 



intelligence, 63-65, 86 ff, 181 

 reactions, 15, 21 ff, 44-47, 49, 

 58-60, 63 ff, 140, 141, 150 

 rhythms, 16 

 tropisms, 18, 21 ff, 44-47, 49, 



58-60, 70 ff 

 Prowazek, S. von, 90 

 Psammobia, reaction to light, 41 

 Putter, A., 61, 90 

 Pycnogonids, phototaxis, 56 



Raccoon, intelligence, 242-245, 255 

 Radl, E., 62, hovering in flies, 38 

 movement of eye of Daphnia, 

 57 



