138 



ISAAC STARR, JR. 



is difficult to predict. As it was impossible to stir too vigorously 

 for fear of injuring the larvae and as diffusion is slow across the 

 surface of an unagitated liquid, it seems probable that the oxygen 

 tension of the NaCl solution and the sea water in the control 

 never reached 320 mm. during the experiment. 



TABLE III. 



EXPERIMENT 2. 

 Over 50 larvae examined in each case. 



A. Examined I Hour after Return to Sea Water. 



B. Examined 21 Hours after Return to Sea Water. 



