Editorial Staft 



GARY N. CALKINS Columbia University. 



E. G. CONKLIN Princeton University. 



M. H. JACOBS University of Pennsylvania. 



FRANK R. LILLIE University of Chicago. 



GEORGE T. MOORE The Missouri Botanic Garden. 



T. H. MORGAN Columbia University. 



W. M. WHEELER Harvard University. 



E. B. WILSON Columbia University. 



C. R. MOORE The University of Chicago. 



All communications and manuscripts should be sent to the Man- 

 aging Editor, the University of Chicago, Sept. I5th to June I5th, or 

 to Biological Bulletin, Woods Hole, Mass., June I5th to Sept. I5th. 

 Subscriptions and other matter should be addressed to the Biological 

 Bulletin, Prince and Lemon Streets, Lancaster, Pa. 



Notice to contributors. Every paper to appear in the Biological 

 Bulletin should be accompanied by an author's abstract presenting 

 the chief results of the investigation. The abstract should not exceed 

 225 words in length. 



For indexing purposes there should be, in addition to the title, 

 one or more subject headings indicating in a word or two the divi- 

 sions of the subject discussed in the paper. The entire name of the 

 author (of each author if a joint paper) and the year of birth is also 

 desired. 



