34 



Carbon Assimilation. 



very stable enzyme ; it is not even destroyed by boiling in alcohol 

 for a short time. But if leaves are boiled in water the enzyme is 

 destroyed. 



It should be noted that the enzyme on account of its insolubility 

 remains in the leaf when this is extracted with solvents. 



By treatment with acids, magnesium is removed from the chloro- 

 phyllides with production of the corresponding phaeophorbides. Thus 

 methyl chlorophyllide a (Mg N4C32H3oO)(COOCH3)(COOCH3) 

 gives methyl phseophorbide a (N^C32H320)(COOCH3)(COOCH3). 



The relations of these various substances may be made clear 

 by the following scheme taken from Willstatter. 



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