Page 

 3» Effect of oils, oil extracts, and oil mixed 

 with carbonized sand on the rate of 

 filtration of water • 33 



a. Effects on the efficiency of ciliated 



epithelitjm of the gills (carmine cone method) • 34 



b« Effects on the rate of pinnping of water by 



the intact oyster (apron method) • ••••••• 36 



riiscussion •• 44 



Summary •• ..*•«••• .• 48 



Literature cited •••• ••** • 50 



