BDZ S. W. RANSON AND P. R. BILLINGSLEY 
staining reaction as the fine fibers of the intercellular plexus in 
the cat and dog, and they bear the same relation to these sub- 
capsular dendrites that that plexus bears to the extracapsular 
dendrites. There is every reason to believe that these fibers, 
like those of the intercellular plexus, are the branches of pre- 
ganglionic axons. There seems to be no essential difference 
between the intercellular plexus in man and that which surrounds 
the subeapsular dendrites except that of location. So far as we 
are able to judge from our preparations, the intercellular plexus 
is not so well developed nor so uniformly distributed in man as 
in the dog. In the cat and dog there are almost no subcapsular 
dendrites, and so far as we have been able to see the intercellular 
plexus does not extend beneath the capsule. 
We have already given a somewhat extended account of this 
intercellular plexus and shown that it consists of the ramifications 
of preganglionic axons. Just what is the relation of the rami- 
fications to the dendritic branches? In pyridine silver prepara- 
tions the fibers do not seem to end on the dendrites, but rather 
to form an interlacing feltwork with them. It is probable, how- 
ever, that here the actual terminations of the axonic ramifications 
are not stained. In methylene blue preparations Huber (’99) 
was able to trace some of the fine fibers of the pericellular plexus 
to their termination on neighboring dendrites. 
It seems to be well established that one preganglionic fiber 
may activate several postganglionic neurones (Langley, ’00 b). 
Histological evidence points to three ways in which this can be 
brought about: 1. The branching of preganglionic fibers, each 
branch ending in a pericellular basket about a different neurone. 
The best evidence of this has been given by Huber (’99). Figure 
13 is a reproduction of one of his drawings of fibers from a white 
ramus entering a sympathetic ganglion of the frog. One of 
these fibers is associated with three pericellular plexuses. This 
mechanism for bringing several postganglionic neurones under 
the control of one preganglionic fiber is illustrated diagrammatic- 
ally in figure 15, b. 
2. The ending of dendrites of one cell in the neighborhood of 
another cell so as to come under the influence of the axonic 
ramifications in connection with that cell. This relationship is 
