264. 



URODELA. 



curious. 



thighs of Tritons 



by accident or disease, is very remarkably dis- 

 played by these animals. Numerous experi- 

 ments, the cruelty of which 

 we must again condemn, 

 have been made on them by 

 physiologists of eminence, 

 especially by Bonnet, the 

 results of which are very 

 The arms and 

 ampu- 

 tated sometimes on one 

 side, sometimes on the other, 

 or both on the same side, 

 were constantly reproduced, 

 and the toes were gradually 

 again formed and endowed 

 with motion. The tail too, 

 cut off at various points, was 

 renewed, pushing out by 

 little and little from the 

 amputated base. In one 

 case the same limb was 

 reproduced four times con- 

 secutively in the same ani- 

 mal. Bonnet found that 

 this reproduction was fa- 

 voured by heat and retard- 

 ed by cold. He observed 

 that the parts of excised 

 limbs were often reproduced 

 with remarkable alterations, 

 SKELETON OF SALAMANDER, cithcr of dcfcct or cxccss ; 



the deficiency or exuberance 

 of certain parts taking upon themselves very sin- 

 gular forms. In many species of Tritons the long 



