BIOLOGICAL BULLETIN 



flDartnc Biological Xaboratprio 



WOODS HOLE, MASS. 



Vol. XXVIII 



May, 191 5 



No. 5 



CONTENTS 



MooKE, Artjiur R. 



Ralph S. Lii.lie 



budington, r. a., and 

 Harvey, H. F, 



ShELFORD, V. E., AND 



Powers, E. B. 



PAC.E 



On the Rhythmical Stisceptibility of 

 Developing- Sea Urchin -Eggs to 

 Hypertonic Sea Water 2^3 



On the Conditions of Activation of 

 Unfertilized Starfish Eggs under 

 the Iiifuence of High Tempera- 

 tzires and Fatty Acid Solutions ... 260 



Division Rate in Ciliate Protozoa as 



Infl74enced b v Th yroid Constituents 304 



An Experimental Study of the 

 JMovements of Herring and Other 

 Marine Fishes 31^ 



I'uBLisHKi) Monthly by tw^ 

 MARINE BIOLOGICAL LABORATORY 



PRINTKD AND ISSUED BY 



THE NEW ERA PRINTING COMPANY 

 LANCASTER, PA. 



Agent for Great Britain 



WILLIAM WESLEY 

 & SON 



Agent for Germany 



R. FRIEDLANDER 

 & SOHN 



28 Essex Street, Strand 

 London, JV. C. 



Berlin N. W. 

 Carlstrasse, 11 



Single Numbers, 75 Cents. Per Volume (6 numbers), S3.00 



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

 under Act of Congress of July 16, 18S*. 



