65] 



RATE OF REGENERATION— ZELENY 



65 



Table 37. A graphic representation is given in Figure 8. There is a grad- 

 ual increase with increase in removed length. The fractions obtained by 

 dividing by the removed lengths are : 



0.62 0.80 0.70 1.1 1.7 2.3 



, , , , , and 



1.5 2.8 4.9 8.4 13.1 18.1 



They give specific lengths of 0.42, 0.30, 0.14, 0.13, 0.13 and 0.13. The 

 smaller removals still have the larger specific lengths but with removals 

 of 4.9 mm. and more there is an approach to constancy. The relations 

 are shown graphically in Figure 9. 



T3 

 <L> 



-t-> 

 03 

 u 

 <v 

 a 

 o> 



60 

 4> 

 h 



m 



.a 

 ■*-> 

 bo 



c 

 © 



mm. 

 2.0 



1.0 



Figure 8 



1.5 2.8 4.9 8.4 13.1 



— >■ Lengths removed in mm. 

 Rana clamitans Second regenerations Six days 



18.1 



a 

 u 



C 

 « 



■>-> 



M 



a 

 o> 



o 



o 



mm. 



0.40 

 0.30 

 0.20 

 0.10 



Figure 9 



1.5 2.8 4.9 8.4 



— >■ Lengths removed in mm. 

 Rana clamitans Second regenerations 



13.1 



18.1 



Specific lengths Six days 



The rate of regeneration between the sixth and the eighth day for 

 second regenerations is not quite as high as for the preceding period, 

 but mitotic divisions are still very numerous and differentiation of the 

 cells is just beginning. At eight days the regenerated lengths are 

 respectively 0.9, 1.1, 1.2, 1.8, 2.7 and 3.7 mm. as shown in table 37. 

 The increase in regeneration with increase in removed length is evident. 

 The relations are shown in Figure 10. Dividing by the removed lengths 

 the fractions obtained are 



0.9 1.1 1.2 1.8 2.7 3.7 



1.5 



2.8 



4.9 



8.4 13.1 



and 



18.1 



