BIOLOGICAL BULIETIN, VOL. XXIV 



CURVE 5 



CURVE 6 



30 



20 



10 



5 



May 23 

 June 21 



23 



4 

 26 

 24 



6 7 

 29 

 26 



O 9 10 II 12 13 14 15 C 

 June 14 



17 18 19 20 21 22 23 

 10 13 



25 26 27 28 29 30 31 

 16 19 22 



LILLIE AND JUST 



