428 



HENRY C. TRACY. 



90 



80 



70 



60. 



50 



40 



30 



20 



10 



AW 



Free Swimming 

 Larvae 



30 



Arm 



20 



Addition of 

 3/0,3-5/^.4/0 



X 



80 



70 

 Return 



to n-sea 

 water 1 



60 



Mm 20 30 20 50 



Chart XT Combined Record 



40 



Addition of 



2/o NCL/feo Return 

 to Mormal 

 5e a water I 



AN* 



M m 20 ao o 

 Chart K 



3O 



20 



/Addition 



20 3O 



Return to 



Normal SCJ\ 

 watep 



20 30 O 

 Ch<M.t X 



2O QO 



CHARTS IX-XI. 



