iv Contents. 



Number 3, June, 1909. 



PAOB. 



On Sensations Following Nerve Division. By Shepherd Ivory Franz. 

 (From the Laboratories of the Govenvment Hospital for the Insane, 

 Washington, D. C.) II. The Sensibility of tlie Hairs. With Seven 

 Figures 215 



Modifiability of Behavior in its Relations to the Age and Sex of the Danc- 

 ing Mouse. By Robert M. Yerkes. (From the Harvard Psychological 

 Laboratory. ) With Four Figures , 237 



The Reactions of the Dogfish to Chemical Stimuli. By Ralph E. Sheldon. 

 (Contribution from the Woods Hole Laboratory of the United States 

 Bureau of Fisheries. ) With Three Figures 273 



The Work of J. von Uexkuell on the Physiologj' of Movements and Be- 

 havior. By H. S. Jennings 313 



Number 4, July, 1909. 



Imitation in Monkeys. By M. E. Haggerty. (From the Harvard Psycho- 

 logical Laboratory. ) With Thirteen Figures 337 



Number 5, November, 1909. 



The Morphology of the Forebrain Vesicle in Vertebrates. By J. B. John- 

 ston. (University of Minnesota.) With Forty-five Figures 457 



Some Experiments upon the Behavior of Squirrels. By C. S. Yoakum. 

 (From the Psychological Labor-atory of the University of Chicago.), 

 With Five Figures . .v ^"^^ 



Tropic and Shock Reactions in Perichseta and Lumbricus. By E. H. 

 Harper. (From the Zoological Laboratory of Northwestern Univer- 

 sity.) With Two Figures 569 



Literary Notices ^9 



Number 6, December, 1909. 



The Radix Mesencephalica Trigemini. By J. B. Johnston. (University 



of Minnesota.) With Thirty-two Figures 593 



A New Association Fiber Tract in the Cerebrum with Remarks on the 

 Fiber Tract Dissection Method of Studying the Brain. By E. J. 

 Curran. (Harvard Medical School.) With Three Plates 645 



Visual Discrimination in Raccoons. By L. W. Cole and F. M. Long. With 



One Figure ^57 



A Statistical Study of the Medulla! ed Nerve Fibers Innervating the Legs 

 of the Leopard Frog (Rana Pipiens) after Unilateral section of the 

 Ventral Roots. By Elizabeth H. Dunn. (From the Anatomical 

 Laboratory of the University of Chicago.) With One Figure G85 



Factors Determining the Reactions of the Larva of Tenebrio Molitor. By 



Max Morse. With Two Figures 721 



