Editorial Staff 



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. 



Managing JEMtor 



C. R. MOORE The University of Chicago. 



All communications and manuscripts should be sent to the Man- 

 aging Editor, the University of Chicago, Sept. 15th to June I5th, or 

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Notice to contributors. Every paper to appear in the Biological 

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 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 

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