CONTENTS 



r. The development of certain instincts and habits in chicks. 

 Frederick S. Breed. Pp. iv-78. 



2. Methods of studying vision in animals. 



Robert M. Yerkes and Johx B. Watson Pp. iv 90. 



3. An experimental study on the death-feigning of belostoma (zaitha 

 aucct. ) flumineum say and nepa apiculata uhler. 



Henry H. P. Severin and Harry C. Severin. Pp. iii 44. 



4. The biology of physa. Jean Dawson 



Pp. iii-120. 



5. The function of the vibrissae in the behavior of the white rat. 



Stella M. Vincent. Pp. iv-85. 



