BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological Xaboratcr\> 



WOODS HOLL, MASS. 



Editorial Staff, 



E. G. CONKLIN The University of Pennsylvania. 

 JACQUES LOEB The University of California. 

 T. H. MORGAN Bryn Mawr College. 

 W. M. WHEELER The University of Texas. 

 C. O. WHITMAN The University of Chicago. 

 E. B. WILSON Columbia University. 



FRANK R. LILLIE The University of Chicago 



VOLUME VI. 



WOODS HOLL, MASS. 

 DECEMBER, 1903, TO MAY, 1904. 



