No. 493] EXPERIMENTS IN GRAFTING 



three other cases of regeneration of a limb in this way, 

 and in these the new foot was fiat and broad, and plate- 

 like, but with scant evidence of toes. That the regenera- 

 tion of a new leg is not dependent on this two-fold opera- 

 tion has been shown by Mr. Goldfarb who has also 

 obtained cases of regeneration of the fore-leg of the frog 

 after a single amputation. Since Mr. Goldfarb will des- 

 cribe these cases in detail further description may lie 

 omitted here. 



The toad, being a more primitive member of the Anura, 

 might be supposed to have greater powers of regenera- 

 tion, but experiments have been less successful with it 

 than with the frog. The thickening at the end of the 

 bones forms a large knob, as it does also in the frog at 

 first, but in the toad no subsequent changes appear to 

 take place. 



Experiments with Lizards 

 During the summer of 1904, while enjoying the hospi- 

 tality of the Marine Laboratory of the Leland Stanford 

 University, I carried out many experiments with lizards, 

 but since the results were purely negative they may be 

 given in a few words. In the lizard the tail has the power 

 to regenerate with great facility, but the legs appear to 

 have no power of this sort. I tried grafting parts of the 

 tail in skin-pockets in the legs, in the hope of inciting 

 regeneration. In some cases large pieces were inserted, 



