CONTENTS iii 



Hargitt, Charles W. Observations on the behavior of 



butterflies 250-257 



Yerkes, Robert M. The role of the experimenter in com- 

 parative psychology 258 



Number 4, July-August 

 Walton, Arthur C. The influences of diverting stimuli 



during delayed reaction in dogs 259-291 



Barber, Alda Grace. The localization of sound in the 



white rat 292-31 1 



Hunter, Walter S. The auditory sensitivity of the white 



rat 3 I2 -329 



Dodson, J. D. The relation of strength of stimulus to 



rapidity of habit-formation in the kitten 33 ~336 



Turner, C. H. The mating of Lasius nigcr L 337~340 



Number 5, September-October 



Mast, S. O. The behavior of fundulus, with especial refer- 

 ence to overland escape from tide-pools and locomotion 

 on land 341-350 



Sturtevant, A. H. Experiments on sex recognition and 



the problem of sexual selection in drosophila 35 I- 366 



Vincent, Stella B. The white rat and the maze problem. 

 IV. The number and distribution of errors — a com- 

 parative study 36/-374 



Redfield, Elizabeth S. P. The grasping organ of Dendro- 

 cocluni lacteum 375 - 38o 



Essenberg, Christine. The habits and natural history of 



the backswimmers Notonectidae 381-390 



Shepherd, W. T. Some observations on the intelligence 



of the chimpanzee 39 x -396 



Essenberg, Christine. The habits of the water-strider 



Gcrris remiges 397 _ 4° 2 



Yerkes, Robert M. Maternal instinct in a monkey 403-405 



Hunter, Walter S. A reply to Professor Cole 406 



Number 6, November-December 

 Holmes, S. J. Literature for 1914 on the behavior of the 



lower invertebrates 407~4 I 4 



