

BIOLOGICAL BULLETIN 



OF THE 



HDarine Biological Xaboratorp 



WOODS HOLE, MASS. 



VOL. LIII 



DECEMBER, 1927 



No. 6 





FOLGER, HARRY THOMAS 



HILL, SAMUEL E. 

 HINRICHS, MARIE A. 



WHITING, ANNA R. 



HAYWOOD, CHARLOTTE 

 KING, ROBERT L. 



CHILD, C. M. 



CONTENTS 



The Relation Between the Responses by 

 Amoeba to Mechanical Shock and to Sudden 

 Illumination 405 



Chromosome Numbers in the Genus Bursa. . 413 



Ultraviolet Radiation and the Fertilization 

 Reaction in Arbacid punctulata 416 



Genetic Evidence for Diploid Males in Hab- 

 robracon 438 



Carbon Dioxide as a Narcotic Agent, 1 450 



Origin and Description of Bristle in Droso- 

 phila melanogaster 465 



Experimental Localization of New Axes in 

 Corymorpha Without Obliteration of the 

 Original Polarity 469 



PUBLISHED MONTHLY BY THH 



MARINE BIOLOGICAL LABORATORY 



PRINTED AND ISSUED BY 



LANCASTER PRESS, INC. 

 LANCASTER, PA. 



AGENT FOR GREAT BRITAIN 



WHELDON & WESLEY, LIMITED 



2, j and 4 Arthur Street, New Oxford Street, London, W. C. 2 



Single Numbers, $1.00. Per Volume 6 numbers), S4.50 



Entered October 10 190*. at Lancaster. Pa., as second-class matter under Act of Congress of July 16 1894 



