

BIOLOGICAL BULLETIN 



OF THE 



flfearine 36iolooical laboratory 



WOODS ROLL, MASS. 



Editorial Staff, 



E. G. CONKLIN The University of Pennsylvania. 

 JACQUES LOEB The University of Chicago. 

 T. H. MORGAN Bryn Mawr University. 

 W. M. WHEELER The University of Texas. 

 C. O. WHITMAN The University of Chicago. 

 E. B. WILSON Columbia University. 



HDanaging JEMtor. 



FRANK R. LILLIE The University of Chicago. 



VOLUME III 



WOODS HOLL, MASS. 

 MAY TO NOVEMBER, 1902. 



