INDEX 



293 



Racll, E., phototaxis of Arthro- 



poda, 55 



relation of phototaxis to vis- 

 ion, 56 



Rae, Dr., fear in young ducks, 123 

 Ranatra, behavior after decapita- 

 tion, 105 

 Interference of reactions, 5, 



140 

 phototaxis, 48, 51, 52, 55, 56, 



144 

 Random movements, in chemo- 



taxis, 24-26 



In phototaxis, 21, 22, 41-45 

 role of in learning, 168 

 Rat, imitation, 255, 256 

 Raven, imitation, 257 

 Reason, in apes and monkeys, 



274 ff 



in insects, 203 ff 

 in mammals, 232 ff 

 Reflex action, 11 ff 

 Reflexes, 2, 11 ff 



of pecking, swallowing, 176- 

 177. See also Motor 

 Reflex. 

 Reflex action and instinct, 99 ff, 



116, 117 

 Reighard, J., 231, intelligence of 



fishes, 223, 224 

 Reimarus, H. S., 114 

 Reptiles, intelligence, 229, 230 

 Reuter, O. M., intelligence of ants, 



193 



Rhea, no innate fear of man, 122 

 Rheotaxis, 34, 37 ff, 57 

 Rhesus monkey, intelligence, 262- 



265 



imitation, 271-274 

 Rhumbler, L., 90, behavior of 



Amceba, 68 

 Rhythms, in behavior, 16, 79, 80, 



155-158 

 Righting movements, in Loxo- 



phyllum, 81 

 in starfish, 154, 155, 158 



Romanes, G. J., 10, 114, 138, 279, 



animal intelligence, 2 

 definition of instinct, 91, 92 

 evolution of instinct, 120, 



121 



homing of bees, 196 

 intelligence of dog, 250 

 moth flying to candle, 20 

 Romanes, Miss, intelligence of 

 Cebus, 265, 269, 278, 279 



Sachs, H., tropisms, 19 



Sagartia, effect of hunger on food 



taking, 150 

 geotaxis, 30 



Schaeffer, A. A., 90, 231, food tak- 

 ing in Paramoecium, 72 

 selection of food in Stentor, 85, 



86 

 intelligence of frog, 228, 229 



Schneider, G. H* 114, 190, in- 

 stinct, 1 



intelligence of octopus, 188, 

 189 



Schneider, K. C., 114 



Schrader, M., 17, segmental re- 

 flexes in frog, 107 



Sense of direction, in ants, 193 

 in bees, 193, 196-202 

 in horses, 247 

 in wasps, 193-196, 200, 

 201 



Serpula, reactions to light and 



shadows, 41 



varied reaction to shadows, 

 145 



Shepherd, W., 279, imitation in 

 Rhesus monkeys, 272, 273 



Shenington, C. S., 17, reflex action, 

 11 



Small, W. S., 258, imitation in 

 white rat, 255 



Smith, S., 90, educability of 

 Paramoecium, 86-89 



Sokolowsky, A., 279 



Solen, reaction to shadows, 41 



