58 



ABSORPTION OF LIGHT BY WATER CHANGED 



H ; 



70 h 



60 



50- 



40 



30 



20 



MgCI 2 ,4.96N 

 Depth 2cm. 



0.9 



1.0 



Fig. 14. 



1.2 



80 



70 



60- 



50- 



40 



30- 



20 



10 



H 2 



MgCI 2 ,4.96N 

 Depth 1cm. 



1.15 



1.2 



1.3 

 Fig. 15, 



