the organisms kept under observation until all had dis- 

 integrated. The animals were divided at 10 A.M. Oxygen 

 was passed thru at 10:50 A.M. 



Time of death 

 Nucleated Non-nucleated 

 cell cell 



V 



The injurious action of oxygen, which is doubtless 

 the result of an increase in the oxidations of the cell, 

 took effect somewhat more rapidly upon the cell which lack- 

 ed a nucleus. It is difficult to see how a cell could be 

 killed in a few hours by an atmosphere of oxygen if its 

 oxidations have become depressed. 



(50) 



