GROWTH AND METABOLISM 



125 



^^ 



^O 



i 



Q 

 O 



36-. 



32 



28- 



2^- 



8 



O 



20- y""\ 



16 



I2r- 



: ASH 



/O 12 2 

 !94 7 



10 12 2 

 1943 

 MONTH OF YEAR 



8 /O 



FIG. 19. Seasonal variation in the amounts of various chemical con- 

 stituents in whole plants of Laminaria saccharina from a 

 Scottish loch (after ref. 37). 



