CONTENTS OF VOLUME 7, 1917 



Number 1, January-February pages 



Hess, Carl von. New experiments on the light reactions of 



plants and animals 1-10 



Yerkes, Robert M. Methods of exhibiting reactive tenden- 

 cies characteristic of ontogenetic and phylogenetic stages. . 11-28 



Reese, A. M. Light reactions of the crimson-spotted newt, 



Diemyctylus z'iridcsccns 29-48 



Hunter, Walter S., assisted by Yarbrough, Jos. U. The in- 

 terference of auditory habits in the white rat 49-65 



Lashley, K. S. The criterion of learning in experiments with 



the maze 66-70 



Cole, William H. The reactions of Drosophila ampelophila 



Loew to gravity, centrif ligation, and air currents 71-80 



Olmsted, J. M. D. Geotropism in Planaria maculata 81-86 



Financial statement for 1916. 



Number 2, March-April 



Yarbrough, Joseph U. The delayed reaction with sound and 



light in cats 87-1 10 



Utsurikawa, Nenozo. Temperamental differences between 



outbred and inbred strains of the albino rat 111-129 



Hubbert, Helen B., and Lashley, K. S. Retroactive asso- 

 ciation and the elimination of errors in the maze 130-138 



Lashley, K. S. A causal factor in the relation of the distribu- 

 tion of practice to the rate of learning 139-142 



Rau, Phil. The courtship of Pieris protodice 143-144 



Number 3, May-June 



Carr, Harvey. The distribution and elimination of errors 



in the maze 145-159 



Reeves, Cora D. Moving and still lights as stimuli in a 



discrimination experiment with white rats 160-168 



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