*Social life, of man and lower animals, iiS. 



Sound, subjective sensations of, 207. 



'■"Space perception, of tortoises, 17. 



Sparrow, psychology of, 439. 



*Spaulding, E. G. An establishment of association in hermit crabs, 49. 



Spinal cord, neurologia of in elephant, 369. 



*Spinal ganglion cells, in rat, 27. 



* , nerves, medullated fibers, 209. 



, nerves in selachians, 285. 



Spitzka, E. a. The encephalic anatomy of the races, 369. 



Staining, vital, in Corethra, 368. 



Statistical methods, in psychology, 76. 



Streeter, G. L, Anatomy of the floor of the fourth ventricle, 369. 



*Structure and function as correlative concepts, 63. 



Stuart, T. P. A. Mechanism of accommodation of the eye for distance, 378. 



*Swine, olfactory nerve in, 390. 



'"Phorndike, E. L. Educational psychology, 76. 

 ^ Tortoises, degeneration of fibers in brain of, 203. 



* , space perception of, 17. 



Torus longitudinalis, of teleost, 289. 



T Texkull, J. VON. Movements of the serpent star, 439. 



\ Zanessa antiopa, phototropism of, 291. 



'' Ventricle, fourth, 369. 

 Vision, theories of color, 274. 



\ArArsoN, J. B. Animal education, 70. 



* * * , Some unemphasized aspects of comparative psychology, 360. 



Webster, F. M. Life history, habits, and relations of Obera, 380. 



Wheeler, W. M. A crustacean-eating ant, 379. 



Wilder, B. G. The brain of the sheep, 433. 



*WiLSON, J. G. I\Iotor endings on the muscle of the frog, i. 



Wolff, M. Continuity of tlie ])erifibrillar neuroplasm, 370. 



YERKES, R. M Inhibition and reinforcement of reaction in the frog, 124. 

 * , Nature-study, 418. 



* , Physiology and psychology, s'l- 



, Reaction of Daphnia pulex to light and heal, 2S9. 



* , Space perception in tortoises, 17. 



* , Structure and function as correlative concepts, 63. 



Zuckerkandl, E. Fibers of the alveus, 371. 

 ZuGMAYER, E. Sense organs in the tentacles of the genus Cardium, 371. 

 Zwaardemaker, H. Sensations of smell, 378. 

 , and Quix, F. H. Sensitiveness of the human ear to tones, 378.. 



