BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological Xaboratorp 



WOODS HOLE, MASS. 



Editorial Staff 



E. G. CONKLIX Princeton University. 



JACQUES LOEB The Rockefeller Institute for Medical Research. 



GEORGE T. MOORE The Missouri Botanic Garden. 



T. H. MORGAN Columbia University. 



\V. M. WHEELER Harvard University. 



E. B. WILSOX Columbia University. 



managing Eftitor 



FRANK R. LILLIE The University of Chicago. 



VOLUME XXXII. 



WOODS HOLE, MASS. 

 JANUARY TO JUNE, 1917 



