CRANIAL AUTONOMIC GANGLIA OF SHEEP 453 
branches, as is well shown in figure 6, A. The varicosities and 
intermediate portions of. the fibrils are often in direct contact’ 
with the surface of the cell-body, but they are also found in the 
space between the latter and its surrounding capsule. 
The pericellular plexuses are veritable networks. Anastomoses 
between the fibrils are frequent, and at the nodes varicosities 
usually occur. This reticulate condition can be accounted for 
consistently with the outgrowth doctrine of the development of 
nerve fibers by assuming that the growing preganglionic neurite, 
on reaching the postganglionic cell-body, divides tree-like into 
a number of terminal fibers. ‘These embrace the cell-body on all | 
sides, and, meeting with one another here and there, fuse to form 
the continuous network. 
Although all the end nets are of essentially the same character 
in the autonomic cranial ganglia of the sheep, they vary in com- 
plexity. In the same ganglion one may observe such compara- 
tively simple endings as are shown in figures 8 and 10, and such 
complete and intricate networks as those of figures 6 and 9. In 
the drawings only the fibrils and varicosities on the upper sides 
of the cell-bodies have been represented. By focussing through 
the transparent ganglion cells the continuations of the nets may 
usually be seen on the surfaces away from the observer. 
In my experience with methylene blue used according to the 
injection method the end nets of the sphenopalatine ganglion 
have proved the most difficult to stain satisfactorily. Very fre- 
quently the varicosities have been colored a deep blue without 
affecting the delicate fibrils which connect them. The result 
gives to the cell-body enclosed by the net a peculiar, spotted 
appearance. Figure 7 represents a pericellular plexus of the 
sphenopalatine ganglion in which many of the communicating 
fibrils are invisible, although some of the varicosities on their 
course have taken the stain. 
In the introductory references to the literature dealing with 
cranial autonomic ganglia mention was made of the pericapsular 
‘Nervenfasernetze’ demonstrated through Bielschowsky stain- 
ing by Miiller and Dahl (’10) in a single preparation of the spheno- 
palatine ganglion of man. These bundles of mtertwining fibers 
THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 22, NO. 5 
