Pickwell 



4 

 3 — 





 .01 



VOLUNTARY 

 BUBBLES-^ 



NUMBERS OF VOLUNTARY BUBBLES 

 PRODUCED AND RANGE IN SIZES OF 

 PNEUMATOPHORES PRODUCING 

 BUBBLES 



l_n 



.PNEUMATOPHORES 





i-1. 



•1 r"5 

 ■ I I ! 



.02 



.04 .06.08.1 



.2 



.6 .8 1.0 



2.0 



4.0 6.0 10. 14. 20. 



VOLUME (mm^ 



Fig. 4 - Frequency distribution of voluntarily- 

 expelled bubble s and of pneumatophores in 

 arbitrary increments of size 



393 



