BIOLOGICAL BULLETIN 



flDarine Bioloatcal Xaborator^) 



WOODS HOLE, MASS. 



Vol. XXVIH 



March, 1915 



No. 3 



Sutherland, G. F. 



Richards, A., and 



WOODAVARD, A. E. 



Gi.ASER, Otto 



Curtis, Maynie R. 



CONTENTS 



PAGE 



Nuclear Changes in the Regenerating 

 Spinal Cord of the Tadpole of Rana 

 clatnitans 119 



Note on the Effect of X-Radiation on 



Fertilizin -.. 140 



Cati a Single Spermatozoon Initiate 

 Development in Arbacia? 149 



Studies on the Physiology of Reproduc- 

 tion in the Doinestic Foxvl. XII. 154 



Published Monthly by the 

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Single Numbers, 75 Cents. Per Volume (6 numbers). $3.00 



Entered October 10, 1902, at Lancaster, Pa., as second-class matter, 

 under Act of Congress of July 16, 185i. 



