94 SYDNEY E. JOHNSON 
of a ganglion or may arise from the internode somewhat more 
distally. 
The size of the fibers in cross-section varies from 1.5 to 9 or 
more micra. A small number of medullated fibers less than 
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Fig. 5 A small portion of the second sacral ganglion. Normal specimen. 
The axons and dendrites of the autonomic cells are lightly stained, while the ter- 
minations of the preganglionic efferent fibers are finer and much darker. Com- 
pare this camera-lucida sketch with figure 6. Pyridine silver. X 500. 
Fig. 6 A section of the third sacral ganglion, made thirty days after division 
of the sympathetic trunk between the seventh lumbar and the first sacral gan- 
glion. The intercellular plexus of fine fibers seen in normal ganglia has completely 
disappeared. Pyridine silver. Camera-lucida sketch. X 500. 
1.5u in diameter was seen in the lower poles of the ganglia and 
in the gray rami. Occasionally a few, never more than four or 
five, of these very small medullated fibers were seen in an inter- 
