Oxidation Systems of Organisms 571 



We must remark that just such an expression of the principle of heterogeneity 

 is found in the structure of the pigmentary apparatus of green plants. It is well 

 known that chlorophylls, carotenoids and phycobilins enter into its composition 

 while each of these groups, in its turn, is made up of a large nxmiber of repre- 

 sentatives, differing from one another in their structural-chemical properties, 

 absorption spectra, etc. 



The complexity of the structure of the biologically active systems of green 

 plants corresponds very well with the dynamic state and inconstancy of the 

 conditions of their life. 



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