50 



o 



CO 



40 



lij 

 0.30 



20 





10- 



20% 



Control 



1400 



T I 



1600 

 M E 



1800 



Figture 4* — EffeotB of various conoentrationB of extract of Diesel 



oil in sea water on the rate of water filtration of oysters* Extract 

 was made by using 1,500 ml. of Diesel oil in 1,500 ml* of sea water 

 and shaking three hovirs on each of three suocespive days* Arrow 

 indicates time of addition of exti*aot* Oainnine oone method* 

 Ordinate - velocity of oloacal current in mm* per second} abscissa - 

 time of day* 



