63] 



RATE OF REGENERATION— ZELENY 



63 



and because of irregularity in the outer edge of the regenerating tissue. 

 The regenerated lengths at four days are respectively 0.22, 0.39, 0.24, 

 0.42, 0.50 and 0.52 mm. These data are given in table 37 and are rep- 



1.0 



1.5 2.8 4.9 8.4 13.1 



— >■ Lengths removed in mm. 

 Figure 4 Rana clamitans Second regenerations Ten days 



18.1 



bo 

 a 



- 



o 



<a 



•** 

 o 



- 



02 



mm. 

 0.60 

 0.50 

 0.40 

 0.30 

 0.20 

 0.10 



Figure 5 



1.5 



13.1 



2.8 4.9 8.4 



— >■ Lengths removed in mm. 

 Rana clamitans Second regenerations Specific lengths 



18.1 



Ten days 



resented graphically in figure 6. Dividing the regenerated lengths by 

 the removed lengths the fractions obtained are 



0.22 0.39 0.24 0.42 0.50 0.52 



L50 2~!80 4~!90 8A~6 1310 1810 



giving specific lengths of 0.15, 0.14, 0.05, 0.05, 0.04 and 0.03. These 

 relations are represented graphically in figure 7. There is on the whole 

 a slight increase in regenerated length with increase in removed length 

 but this increase is not proportional to the amount removed so that the 

 proportion regenerated decreases with increase in removed length. The 



