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ILLIXOIS BIOLOGICAL MOXOGRAPHS 



[138 



21/2 times while the one with the highest degree of injury gives tlie lowest 

 regeneration for the fore-leg only i/o times. 



These comparisons show very clearly that the regeneration of a fore- 

 leg is not as rapid when the individual is regenerating no other part at 

 the same time as it is when the other fore-leg is being regenerated at 

 the same time. The additional removal of one-half of the tail does not 

 seem to accelerate the regeneration any further because there is no essen- 

 tial difference between the effect of an additional injury of a fore-leg and 

 an additional injury of a fore-leg plus one-half of the tail. It may be 

 that the effect of additional removal is confined to removal of a similar 

 part, the tail removal in this case involving a different kind of organ. 

 Or it may be that the accelerating effect is found only within certain 

 degrees of injury the limit being exceeding by the highest of the 

 three degrees. 



Amblystoma punctatum Series 4101-4540 

 Experiment I Controls at beginning of experiment 



