DEVELOPMENT OF THE NERVES. 553 



with each other, it seems probable that the latter also proceeds 

 from cells which apply themselves to the surface of the mus- 

 cular fibres. It is to be remembered, however, that those 

 muscle corpuscles that are found between the sarcolemma and 

 the proper substance of the muscle proceed genetically from 

 the latter. This view is based, first, upon the fact that the 

 nuclei of young muscular fibres lie in the medulla ; secondly, 

 that the cortex of the cells undergoes conversion into muscular 

 substance ; and lastly, upon my observations of the relation of 

 embryonal muscle cells to the smaller cells occurring upon their 

 surface. From this point of view the superficial muscle 

 corpuscles of the sarcolemma are perhaps to be regarded as 

 connective-tissue corpuscles. I must also take this opportunity 

 of mentioning that the muscular and connective tissues are to 

 be referred genetically to one and the same origin, and that, 

 consequent on my account of the superficial muscle corpuscles, 

 it must be admitted that they may aid in the regeneration of 

 the muscles. 



The researches of Babuchin have furnished the most recent 

 information upon the development of the nervous system.* 

 From his researches it appearsf that there is no essential differ- 

 ence in minute structure between the axis-cylinder processes 

 and the other processes of the nerve cells. It can nowhere be 

 better shown than in embryonal cells that the axis-cylinder 

 process does not communicate either with the nucleus or with 

 the nucleolus; The embryonic nerve cells which have already 

 fully developed axis-cylinder processes, possess a remarkably 

 large nucleus, so that at first sight it appears as if it were quite 

 naked, and was applied immediately to the extremity of the 

 axis cylinder, like the head of a knitting-needle to the needle 



* The plan of the editor was to treat this question in connection with 

 the description of the electric organs. Professor Babuchin undertook this 

 article, and repeatedly visited the coasts of the Adriatic with a view of 

 carrying on his investigations. Babuchin, however, has this year found it 

 necessary to travel into Egypt for pursuing this very study. But as the 

 completion of this work could not be postponed till his return, the editor 

 has determined to stop at this point. The results of Babuchin's researches 

 will appear as a special part supplementary to this work. 



t Centmlblatt, 1868. 



