135] RATE OF REGENERATION— ZELENY 135 



the first to the second period, 0.000 from the second to the third, — 0.022 

 from the third to the fourth, —0.042 from the fourth to the fifth, —0.025 

 from the fifth to the sixth and 0.000 from the sixth to the seventh. 



7. The average accelerations of specific rate for the four deepest 

 levels between the same periods are respectively +0.009, 0.000, — 0.004, 

 —0.005, —0.003 and 0.000. 



8. The average percentage increments between the same periods are 

 respectively 98, 29, 17, 6, 1 and 0. 



9. The experiments on salamander larvae show a similar change in 

 rate of regeneration during the process but the number of individuals 

 is too small to allow an analysis of the data. 



10. The changes in rate that have been noted bear a definite relation 

 to the histological changes that have been observed during the regener- 

 ation of the tail. 



