THE PROCESS OF EXCITATION 117 



Whether or not the same applies to the single living cell, if the 

 unicellular organism likewise undergoes a quantitative increase 

 by a continuous functional excitation, and if the single cell pos- 

 sesses in itself a corresponding mechanism of self-regulation 

 similar to the cell community in the vertebrates, cannot be 

 answered, for concerning all these problems information is lack- 

 ing for the present. 



