GENETICS 



A Periodical Record of Investigations Bearing on 

 Heredity and Variation 



EDITORIAL BOARD 



GEORGE H. SHULL, Managing Editor 

 Princeton University 



WILLIAM E. CASTLE EDWARD M. EAST 



Harvard University Harvard University 



EDWIN G. CONKLIN ROLLINS A. EMERSON 



Princeton University Cornell University 



CHARLES B. DAVENPORT HERBERT S. JENNINGS 



Carnegie Institution of Washington Johns Hopkins University 



BRADLEY M. DAVIS THOMAS H. MORGAN 



University of Pennsylvania Columbia University 



RAYMOND PEARL 



Johns Hopkins University 



GENETICS is a bi-monthly journal issued in annual volumes of about 

 600 pages each. It will be sent to subscribers in the United States, the 

 Philippines, Porto Rico, etc., for $6 per annum for the current volume, 

 and $7 per volume for completed volumes until the edition is exhausted. 

 Canadian subscribers should add 25 cents for postage. To all other 

 countries 50 cents should be added for postage. Single copies will be 

 sent to any address postpaid for $1.25 each. 



All subscriptions, notices of change of address, and business corre 

 spondence should be sent to the Princeton University Press, Princeton, 

 New Jersey, and all remittances should be made payable to the Princeton 

 University Press. 



Entered as second-class matter February 23, 1916, at the post office at 

 Princeton, N. J., under the act of March 3, 1879. 



