153] 



RATE OF REGENERATION— ZELENY 



153 



ning with the lowest degree of injury are respectively 1.50, 1.73, 1.86 

 and 1.88 mm. 



The additional removals are in every ease removals of leg material 

 and the result agrees with that of experiment I in giving an increased 

 rate of regeneration of a part when similar organs are removed at the 

 same time. 



TABLE 100 

 Amblystoma punctatum Series 4005-4008 

 Length of regenerated hind leg in millimeters for different degrees of injury- 

 Twelve days 



Catalog 

 number 



4005 

 4006 

 4008 



Average 



One 

 hind-leg 



1.35 

 1.65 

 1.50 



1.50 



Degree of injury 



Both 

 hind-legs 



1.90 

 1.80 

 1.50 



1.73 



Both hind- 



legs+one 



fore-leg 



1.95" 

 1.82 

 1.80 



1.86* 



Both hind- 



legs+both 



fore-legs 



1.75 



1.92" 



1.85" 



1.84 



TABLE 101 



Amblystoma punctatum Series 4005-4008 



Length of regenerated fore-leg in millimeters for different degrees of injury 



Twelve days 



Experiment IV Amblystoma punctatum Series 4005-4008 



In this experiment the regeneration of the right fore-leg is compared 

 under conditions of differing degrees of additional injury. In one com- 

 bination there is an additional removal of the two hind legs and in the 



