140 KIYOYASU MARUI 



it is probablj^ of nervous nature, because he believed to have 

 found in the first place that the ends of the neurites are directly 

 connected with the Golgi net and in the second place that the 

 neurofibrils of the ganglion cells are combined with the nodal 

 points of the Golgi net-work. But Held (18) raised the ques- 

 tion whether the different authors have really seen the same 

 structure. He said: ''There is no doubt that certain net-struc- 

 tures of the Golgi preparations and the methylene-blue picture 

 of Semi Meyer and Bethe's net-work are identical. What char- 

 acterizes them is above all a certain monotony of the net figure 

 and the stiffness of the net beams and further the nodal points 

 of the mesh are generally not considerably thicker than the 

 beams themselves." He then declared that Semi Meyer had 

 seen something different, because Meyer's figures offered no proof 

 of the nervous nature of his net-work, as it was stained isolated 

 and without any relation to the nerve fibers. As regards Bethe's 

 opinion, Held assumed that neither Golgi nor Bethe had fur- 

 nished the necessary evidence. According to him, the statement 

 of Golgi^ that the neurofibrils of the gray matter unite with the 

 net-work around the nerve cells proves nothing, because in Gol- 

 gi' s method the impregnation can jump from the branching nerve 

 fibers to the thoroughly disconnected net structure and create a 

 false connection between them. On account of the same reason, 

 Held (18) denied the conclusiveness of his own Golgi prepara- 

 tions, in which the close relation between the nerve endings and 

 the net-work was distinctly visible (fig. 8, table 13, 1902). Nor 

 did the figures and the statement of Bethe about the transition 

 of neurites into Golgi net beams seem trustworthy to him, al- 

 though he was not able to give any special reasons for this. As 

 far as the findings of Auerbach are concerned. Held thought 

 that Auerbach had observed a similar structure and had inter- 

 preted it essentially alike. On the basis of these considerations. 

 Held (18) came to the conclusion that on the surface of certain 

 ganglion cells of vertebrates there exist two different kinds of net- 



» Jahresbericht v. Merkel u. Bonnet, 1894. Cited in Held's 1902 (18). 



