LIST OF ILLUSTRATIONS continued 



Page 



Figure 6. Filtering bacteria from diluted fraction of water 



sample 15 



Figure 7. Dialyzer bags filled with cultures of E^. coli 



in seawater 15 



Figure 8. Translucent and opaque cages for holding bagged 



water samples 16 



Figure 9. Emptying dialyzer bag into sterile test tube 16 



Figure 10. Bacterial colonies on duplicate sets of membranes for 

 120-hour samples from translucent cage at 200-foot 

 depth 17 



Figure 11. Bacterial colonies on duplicate sets of membranes for 



120-hour samples from opaque cage at 200-foot depth . . . .17 



Figure 12. Bacterial colonies on duplicate sets of membranes for 

 120-hour samples from translucent cage at 1,000-foot 

 depth 18 



Figure 13. Bacterial colonies on duplicate sets of membranes for 



120-hour samples from opaque cage at 1,000-foot depth . . .18 



LIST OF TABLES 



Table 1 . Survival of E^. coli at Sea 5 



Table 2. Effect of Sunlight on Survival of E. coli 7 



