OXYGEN SUPPLY OF CERTAIN ANIMALS 315 



without oxygen, but do not possess the necessary enzyme complex 

 for the performance of such a reaction. 



c. That a process in the decomposition of plant tissues, even 

 under anaerobic conditions, is gradually liberating small amounts 

 of oxidizing substance had been demonstrated. That this 

 oxidizing substance is atomic oxj^gen has not been absolutely 

 proved, but experiments indicate that it is. If this oxidizing 

 substance is atomic oxygen, then it can be utilized by all animals, 

 living as they do in close relationship with the disintegrating 

 plant fragments. The writer believes that the oxidizing sub- 

 stance produced by plant fragments is probably atomic oxygen 

 and that it forms the oxygen supply of those animals living in 

 Lake Mendota under conditions where the surrounding water 

 shows no trace of dissolved oxygen. 



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