*Toad, sympathetic nervous system, 113. 

 *TriaI and error method of learning, 98. 



method of reacting, 172. 

 *Tropism, terminology, 138. 

 *and random movement, 98. 



theory of, 169. 



V 



nicellular organisms, reactions of to 

 electricity, 528. 



"\7'agus nerve, action of delphinin on, 72. 



• Variation, in brain-weight, 467. 

 ♦Vertebrate, morphology of head of, 175. 

 binocular vision in, 457. 

 *spinal nerves in, I. 

 Vision, and pigment, 174. 



binocular and stereoscopic, 457. 



*V\/'atson, J. B. Effect of bearing 



• '' young on rat, 514. 

 Werndly, L. Turning fork-sound etc., 



75- 

 Wernicke, C. Work of, 525. 

 Weysse, a. W. Animal behavior, 174, 

 WOLLENBERG, R. Hypochondria, 540. 

 WooDWORTH, R. S. and Sherrington, 

 C. S. A pseudaffective reflex, 74. 



*V7'erkes, R. M. Genetic relations of 

 ■* types of action, 132. 

 *Hearing in frog, 279. 



