1906.] 



Regeneration of Nerves. 



273 



own preparations of transplanted nerves under the skin we could by careful 

 search discover a few medullated fibres, but this was not the case where the 

 nerve trunk had been transplanted under the peritoneum, in which situation 

 invasion by neighbouring nerves is nearly impossible. 



Fig. 3. — A small blood-vessel entering the sheath of a fasciculus of transplanted nerve, 

 as described in the text. 280 diameters. 



The connective tissue between and around the bundles of nerve-fibres 

 retains its normal relationship. This is, however, not a property of nerve 

 tissue in particular, for any structure of a similar shape would become 

 enclosed in a sheath of fibrous tissue unless it were completely absorbed. 

 This is well illustrated in fig. 4, which shows a transverse section of a strand 

 of catgut which had been enveloped in the stomach wall. 



The connective tissue has organised around the catgut threads, forming a 

 framework which strongly suggests the sheath of nerve fasciculi. 



We may sum up our results of these experiments by saying that we have 



VOL. LXXVIII. — B. Y 



