129] 



RATE OF REGENERATION— ZELENY 



129 



Experiment VI Amblystoma punctatum Tail Series 3962-4004 



First, second and third regenerations after removal of approximately 

 one-half of the tail were studied. The complete data are given in the 

 section on the effect of successive removals. Measurements were made at 

 2, 4, 6, 8, 10 and 14 days. The rates per day are given in Table 71. The 

 maximum rate comes between 8 and 10 days agreeing with the other data 

 for regeneration of the tail in salamander larvae. 



The percentage increments are given in Table 72. The highest 

 rate comes at the earliest period, between two and four days, and is 

 followed by a rapid and then a slower decrease. 



TABLE 69 

 Amblystoma punctatum Series 4101-4540 

 Rate of regeneration per day of tail at different times during the regenerative 

 process for two degrees of injury 



Period 

 of 

 regeneration 

 Days 



0-2 



2-4 



4-6 



6-8 



8-10 



10-12 



12-14 



14-16 



16-19 



Middle of 



period 

 Days after 

 operation 



11 



13 



15 



17% 



Rate of regeneration per 

 day for each period 



One-half 

 tail 



0.17 



0.19 



0.29 



0.37 



0.69* 



0.46 



0.23 



0.37 



0.16 



One-half 



tail .+ 



fore-legs 



0.13 



0.27 



0.25 



0.47 



0.50 



0.46 



0.37 



0.53* 



0.03 



Average 

 rate 



0.09 



