J L 



J I L 



o-o 



■ > I I iL 



300- 



250 



(0 



tr 



UJ 



200- 



150 



100 



50 



O 



/ ^ 



O 



\ 



o 



/ 



Figure 14, Effect of crude oil mixed with carbonized sand on the 



percent of time oysters remain open and on the total voliune of 

 water pumped. Oyster No. 5, experlDiental and oyster No. 6, control. 

 The control is indicated by open circles. Rubber apron method. 

 August 4 to 17, 1948, 



