27. 



No att 3Tnpt h-i.s bo on mad j horjinabrva to 

 expl'iin the chrcT.oscir.o mechanism in det'^.il. 

 ChrcrnoGoiTGS dc not occur in the simplest 

 organisms such as the bactaria, but app 3'\r to 

 bo th3 first stago in ovoluti^n to high or 

 typos, whorsas the purpr^so of th o prosont 

 treatise is to oxp] ain 1 if o processes only 

 in so far as they aro of universal occurrence 

 and common to all forms of life. 



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