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Figure 16, — - Photograph of a kymograph record of shell movement and 

 rate of pumping of water by the control oyster (No. 5), of the 

 experiment shown in figure 15. Each stroke of the second line of 

 each group represents the discharge of 265 ml. of sea water. Other 

 explanftions the same as in figure 15 with the exception that no 

 oil was introduced into the sea water. 



