Carbon Assimilation . 
19 
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 N 4 C 32 H 3 0 O)(COOCH 3 )(COOCH 3 ) 
gives methyl phaeophorbide a (N 4 C 32 H 32 0)(C00CH 3 )(C00CH 3 ). 
The relations of these various substances may be made clear 
by the following scheme taken from Willstatter. 
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