NERVUS TEEMINALIS: MAMMALS 33 



Very few binucleated cells of the multipolar type were ob- 

 served. These, as illustrated by the one represented in figure 

 9, were similar in every other respect to other multipolar cells. 



Fibers and fiber networks. A few of the individual cells were 

 surrounded by a reticulum of delicate fibers which suggest an 

 extracapsular network (fig. 17). The capsule itself was not easy 

 to see in such cases, but the position of the capsule nuclei within 

 the network seems to justify the interpretation given to these 

 reticula. In the example illustrated, a small number of threads 

 extend from the region of a neighboring bipolar cell and take 

 part in the formation of the pericellular plexus described. The 

 main fiber from which these threads have their origin, runs par- 

 allel to the larger process of the bipolar cell, and appears to ter- 

 minate in a spiral (fig. 17) about this process. The fibers form- 

 ing this network are intertwined in the most confusing manner 

 in every direction. They are of very small size. "^ 



Intercellular networks also were found in those parts of the 

 preparations where the impregnation was most favorable. A 

 peculiarity of the impregnation revealed itself in the fact that 

 those parts of the sections which showed the fibers most clearly 

 did not serve so well to differentiate the outlines of the cell 

 bodies and of the large processes from the perikaryon. 



The intercellular networks were found in every case at nodal 

 points where a number of fiber strands converge. Usually the 

 ganglion cells enclosed by such a network were of small size, but 

 occasionally a larger cell was also included. In the example il- 

 lustrated (fig. 16), which was situated near the lower margin of 

 the posterior portion of the olfactory bulb, four strands of fibers 

 converge about a sniall group of cells. Many of the individual 

 threads may be followed from one strand through the cell cluster 

 and into one of the other converging strands, without any ap- 

 parent connection with the cells. The majority of fibers were 

 lost in the network. A few may be seen to connect with nerve 

 cells of the cluster. 



This intercellular network resembles to a considerable degree 

 structures of a similar nature found by Dogiel ('95) in the di- 

 gestive tract of the dog. It bears an even more striking resem- 



THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 30, NO. 1 



