107] RATE OF REGENERATION— ZELENY 107 



6. It does not seem probable that the differences in length regener- 

 ated at different levels can be due to differences in tlie original character 

 of the cells involved in the process. Such a well graduated difference 

 in cell capacities is difficult to conceive. The process must be iinder a 

 more central control, probably connected with general functional 

 activity. 



