280 VEGETABLE PHYSIOLOGY 



them as formed partly by the processes of oxidation and 

 reduction, which we have seen are often associated with its 

 activity, and partly by subsequent further decompositions 

 of bodies originally thus formed, we can trace them ultimately 

 to protoplasmic activity, and may consequently regard their 

 formation as belonging to the katabolic processes going on 

 in the organism. 



