INDJ-.X 



309 



Shark, 40, 232 



Sherrington. 158 



Shock-effect, 126, 147, 298 



Sleep, 243, 257 



Space-sensations, 168, 242, 301 



Specific energy of nerves, 290, etc. 



Speck, 215, 255, 258 



Spencer, 211 



Sphincter ani, 41 



Spinal cord, reflexes of, 137 



soul, 250 



Spinal nerves, 134 

 Spontaneity, 8 



relation to central nervous system 



in general, 78 



relation to cerebral hemispheres, 



139. 157, 239-242 



relation to ganglia in Arthropods, 



1 08 



relation to ganglia in Medusas, 18, 



21 



relation to ganglia in Planarians, 



74. etc., 77 



relation to ions. See Medusa. 



relation to supracesophageal gan- 



glion, 106, 116, 121, 123, 128 

 Squilla, 119, 121 

 Starfish, 61, etc. 

 Steinach, 40, 47 

 Steiner, 127, 128, 133, 140, 149, 156- 



159, 175, 182 

 Stereotropism, in Actinians, 59 



in Amphipyra, 184 



in Crustaceans, 119 



in earthworm, 88 



in eel, 248-250 



in Nereis, 92, 93, 185 



in starfish, 65 



in Thysanozoon, 74 



in Tubularia, 184 

 Stinging reflex of bees, 123 

 Subctsophageal ganglion in annelids, 



82 



in Astacus, 116, 120 



in bees, 123 



in Limulus, 106 



in Mollusks, 128 

 Supracesophageal ganglion in Arthro- 

 pods, 104, etc., 114 



in bees, 123 



in Mollusks, 128 



in worms, 90, 92 



Temporal lobes, 262 

 Thalami optici, 139 

 Thorndike, 286, 288 

 Threshold of stimulation, 46 



after loss of ganglion, 37-39 

 Thyroid gland, 207 

 Thysanozoon, 72, etc. 

 Tiaropsis, 31 



Tone of muscles, 152-159 



after injury to cerebral hemi- 



spheres, 266-269. 



after loss of supraoesophageal 



ganglion, 117, 124 



after severing of posterior roots, 



135 



relation to galvanotropism, 160- 



169 



Tornier, 203 

 Trigeminus, 136, 209 

 Trophic nerves, 208-210 

 Tropisms, identity of animal and 



plant heliotropism, 5, 179 



importance of, for instincts, 6, etc., 



178-200 



importance of, for psychology, 13, 



221. etc., 249 



mechanics of, 161, 179-181, 186- 



190 



Tubularia, 184 

 Turtle, 30 



Uexkull, v., 130, 133, 156 



Vasomotors. See Blood-vessels. 

 Veblen, 197 



Visual spheres, 269-273 

 Vulpian, 113, 126, 175 



Ward, 116 



Wasmann, 226, 235, 287, 288 



Wasps, 196, 224-227 



Water-beetle, 123 



Wave character of innervations, 29! 



303 



Welch, 303 



Whitman, 99, 100, 286, 288 

 Will, 215, 302 

 Wolff, 279, 288 

 Worms, 72, etc., 229 



_^~~f^l : 



Yersin, 122 

 Zuntz, 108 



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