424 



HENRY C. TRACY. 



Leuvae Just Hatched 



o 



Minutes 2O 3O 

 Ch6rt I 



Ret u r n TO No r ma 



Sea Wafer 



50 



40 



30 



'.. 



/ydilion 

 of 2,/o 

 HCL^o 



20 



Return to 

 Normal 

 Sea Wateij Q 



30 



MiruneaT.80 30 o 

 Chart I 



Addition of 3 



20 



Return to 

 Normal 



Sea Water 



CFlartini 



Minules 2O 30 O 

 Chart EZ 



JO 



10 



"Return ta 

 Nor. Sea Water 



S.MB 



'Minutes 2> 30~ O 

 Charts 



2-0 



CHARTS I-V. 



