147] 



RATE OF REGENERATION— ZELENY 



147 



parisons the group with no additional injury is ahead seventeen times 

 and the additional injury group sixteen times. Taking the individual 

 cases by time groups the individuals with no additional injury are ahead 

 5y 2 times and those with an additional injury 3y 2 times. 



These comparisons show no advantage of one combination over the 

 other. The additional removal of the fore-legs does not retard nor does 

 it accelerate the regeneration of the tail. This result strengthens the 

 view that the acceleration in Experiment I is probably due to the addi- 

 tional removal of material similar to that whose rate is being studied. 



TABLE 89 



Amblystoma punctatum Series 4101-4540 



Length of regenerated tail in millimeters for different degrees of injury 



Two days 



Degree of injury 



Catalog 

 number 



4131-21 

 4231-21 

 4331-21 

 4431-21 

 4531-21 



Average 



One-half 



tail 



+ fore-legs 



0.15 

 0.35 

 0.25 

 0.30 

 0.30< 



0.27 



TABLE 90 



Amblystoma punctatum Series 4101-4540 



Length of regenerated tail in millimeters for different degrees of injury 



Four days 



Catalog 

 number 



4132-22 

 4232-22 

 4332-22 

 4432-22 

 4532-22 



Average 



Degree of injury 



One-half 



tail 



4- fore-legs 



1.00* 



0.90 



0.60* 



0.95 



0.60 



0.81* 



