266 



Index 



Random movements, 164 



role in orientation, 70-78 

 Reason in animals, 9, 259-262 

 Reeves, C. D., 230, 231 

 Regeneration and behavior, 



166 if. 



Reimarus, S. H., 19, 20 

 Rheotaxis, 64, 65 

 Rhumbler, L., 180 

 Robertson, T. B., 212, 213 

 Romanes, G. J., 26, 27, 28, 53, 



79, 122, 214 

 Roux, W., 180 

 Royce, J., 66, 67 



Sachs, J., 52, 53 

 Schmidt, P., 209, 214, 216 

 Severin, H. C. and H. H. P., 



209, 210, 212, 213, 214 

 Sex in mental evolution, 239 ff. 



recognition of, 219 ff. 

 Slime molds, behavior of, 193 

 Spence, W., 199 

 Spencer, H., 24, 25, 28, 31, 50, 



51, 132, 133, 139, 163, 164 

 Spiders, death feigning of, 200, 



212, 213 

 Stahl, E., 97 



Stentor, behavior of, 125-127 

 Strasburger, E., 96, 97, 98, 101 



Temperature, influence on tro- 

 pisms, 94, 101-103 



Terns, death feigning of, 205, 

 206 



Thigmotaxis, 103-105, 115, 182, 

 184, 186, 189, 215 



Thomasius, 17 



Thorndike, E., 33, 139-142, 144, 

 149-151 



Torrey, H. B., 89 



Towle, E. W., 104 



Trial and Error, 155 ff., 254 ff. 



Tropisms, relation of to in- 

 stinct, 31, 32, 52, 62, 63 

 reversal of, 93 



Verworn, M., 99, 214 



Voice, primary function of, 



241-243 

 Voltaire, 67 

 Volvox, reaction to light, 99, 



107, 109-111, 114 



Wasmann, E., 22, 27, 121 



Weismann, A., 28 



Whitman, C. O., 28, 41, 42, 



123 



Wilson, H. V., 194 

 Wundt, W., 28, 122 



Talorchestia, death feigning of, Yerkes, R. M., 33, 104, 129 



203, 204 

 phototaxis in, 57, 94 Zur Strassen, H., 195 



