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Figwre 7, — - Effects of aerated extracts of crude oil in a concentration 

 of 30 percent on the rate of water filtration of oysters. A mixture 

 of 160 ml, crude oil and 16 liters of sea water was left standing and 

 aerated for six days. Arrow indicates time of addition. Carmine 

 cone method. Plotting as in figures 3 and 4* 



