CONTENTS, 



Physiological Evidence of the Fluidity of the Conducting Sub- 

 stance in the Pedal Nerves of the Slug — Ariolimax colum- 

 bianus. By O. P. Jenkins and A. J. Carlson. From 

 the Physiological Laboratory of Leland Sta^iford, Jr. , Uni- 

 versity. With one figure. . . . . . .85 



The Nervous Structures in the Palate of the Frog : the Periph- 

 eral Networks and the Nature of their Cells and Fibers. 

 By C. W. Prentiss, Instructor of Biology, Western Re- 

 serve University. With 12 figures. . . . '93 



The Beginnings of Social Reaction in Man and Lower Animals. 



By C. L. Herrick, Socorro, New Mexico. . . .118 



Inhibition and Reinforcement of Reaction in the Frog, Rana 

 clamitans. By Robert M. Yerkes. Fro7n the Harvard 

 Psychological Laboratory. . . . . . .124 



On the Behavior and Reactions of Limulus in Early Stages of its 

 Development. By Raymond Pearl. From the Zoological 

 Laboratory of the University of Michigan. With one 

 figure. 138 



Editorial. .......... 165 



Recent Studies on the Fin^r Structure of the Nerve Cell. By 



G. E. CoGHiLL, Professor of Biology, Pacific University. 171 



Literary Notices. ........ 203 



THE JOURNAL OF COMPARATIVE NEUROLOGY AND PSY- 

 CHOLOGY is published bi-monthly. The annual volume of six numbers 

 comprises about 500 pages, with plates and text-figures. The subscription price 

 is $4.00 a year, strictly net (foreign subscription, $4.30, 18 s., M. 18, 22 fr,, 

 L. 22), postage prepaid. 



Authors receive 50 reprints of their papers gratis and additional copies 

 are supplied at cost. All MSS. and matter for review relating to the Structure 

 of the Nervous System and all business correspondence should be addressed 

 to the Managing Editor at Denison University, Granville, Ohio. 

 Editorial Matter relating to Comparative Psychology and the Physiology of the 

 Nervous System should be sent direcdy to Dr. Robert M. Yerkes, Psycho- 

 logical Laboratory, Harvard University, Cambridge, Mass. 



tSntered as second-class matter in the Postoffice at Granville, O. 



