FINER STRUCTURE OF SYNAPSE 153 



these preparations, as the intracellular neurofibrils were often 

 not impregnated quite distinctly in them. So my finding corre- 

 sponds to that type of the terminal feet of Held, in which the 

 fibrils were followed in radial direction from the terminal feet 

 into the cell body; the connection by means of a fibril net-work 

 did not come to my observation. 



Figure 9 demonstrates the condition of the synapse in the 

 Bielschowsky preparation; on the surface of the axone cap, we 

 see a number of nerve fibers going into the region of the 'axone 

 cap;' Weigert and Heidenhain preparations show that they lose 

 their myehn sheaths just at the border of the 'axone cap.' Some 

 of these nerve fibers have each a large club-like expansion here 

 and before the loss of their myelin sheaths. According to my 

 experience, this phenomenon is more noticeable in Ameiurus 

 than in Carassius; in regard to the significance of this finding I 

 am not able to say anything definite as yet. On their way to 

 the surface of the cell the unmeduUated fibers have single or 

 multiple spheroidal or spindle-shaped swellings; sometimes the 

 fibers look like a string of pearls showing many of these swel- 

 lings. There is no doubt that these enlargements are identical 

 to the 'bontones de Auerbach' and the 'bontones de trajecto' of 

 Cajal. In my preparations these nodes came out partially dif- 

 fusely black and partially punched as Bielschowsky (18) described 

 them. Besides these I could find also 'bontones' with splitting 

 of the nerve fibers into numerous delicate fibrils (fig. 13), just 

 like those which were described above in my Cajal preparations. 

 The net-work, as was described by Wolff (27) from his Bielschow- 

 sky preparations, I could not demonstrate at all in them. In my 

 Bielschowsky preparations I could not find any place, where the 

 contact between the 'bontones de traecto' and the cell surface 

 takes place, as was described and figured by Cajal. It is quite 

 obvious in my figure 9 that at least there are many of those 

 'bontones' which lie quite remote and free from the cell surface. 

 From the peripheral end of the terminal feet single or multiple 

 delicate fibrils come out and proceed toward the cell surface, 

 surrounded by the homogeneous substance, and enter the cell 



