BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological laboratory 



WOODS HOLE, MASS. 



Editorial Staff 



E. G. CONKLIN Princeton University. 



JACQUES LOEB The Rockefeller Institute for Medical Research. 



GEORGE T. MOORE The Missouri Botanical Garden. 



T. H. MORGAN Columbia University. 



W. M. WHEELER Harvard University. 



E. B. WILSON Columbia University. 



EMtor 



FRANK R. LILLIE The University of Chicago. 



VOLUME XXIX. 



WOODS HOLE, MASS. 

 JULY TO DECEMBER 1915 



