Experiments in Transplanting Limbs 



269 



more fully represented than the muscular. With regard to the 

 former it may be pointed out that some variations in position and 

 origin have been observed. These have been noted in both the 

 "aneurogenic" and normal limbs and in the primary as well as in 

 the secondary. It follows that we cannot discriminate between the 

 different types of limb as regards their ability to acquire a normal 

 nervous system. 



* It is uncertain -which of these should be regarded as the more completely innervated . 



Transplantation of Normal Limbs to Nerveless Regions 



The object of the following experiments was to test the power 

 of peripheral nerve fibers to develop when entirely cut off from 

 nervous connection with the centers. It has already been shown 

 that both Braus and Banchi have failed to establish their claim 

 that the nerves have this power, for in their experiments the 

 nerves studied were contained in appendages that were implanted 

 into regions where numerous nerves were present. The only 

 crucial test of this question by means of the method of transplan- 

 tation is to graft tissues containing developing nerves to the body 

 of an individual in which nerves are entirely lacking, or at least 

 to an extensive nerveless region. 



While no difficulty has been encountered in obtaining tadpoles 

 with extensive nerveless regions, it has heretofore been found 



