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398 SYDNEY E. JOHNSON 
and the sympathetic trunks divided between the seventh and the 
eighth ganglia. Immediately after injection both anterior and 
posterior sections of the left sympathetic trunk were dissected 
out and treated by the pyridine silver process. 
Figures 11 and 13 show typical sections of the anterior ganglia 
stained by the methylene blue (fig. 11) and the pyridine silver 
(fig. 13) method. It should be noted that figure 138 was drawn 
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Fig. 11 Section from 5th or 6th ganglion of specimen No. 27. Spirals are 
readily found in these sections. This specimen was injected with methylene 
blue thirty-one days after section of both sympathetic trunks, between the 7th 
and the 8th ganglia of the trunks, and destruction of the spinal cord to the 4th 
vertebra. Both sections (i.e., anterior and posterior) of the left sympathetic 
trunk were removed and stained by the pyridine silver method (figs. 13 and 14). 
x 488. 
Fig. 12 Section of a ganglion of the same specimen (No. 27), from posterior 
section of the sympathetic trunk. Note total absence of spirals and pericellular 
baskets. Methylene blue. X 488. 
Fig. 13 From the second ganglion (anterior section) of the left sympathetic 
trunk, specimen No. 27. Note the large number of spirals and darkly stained 
preganglionic fibers. Pyridine silver. X 488. 
Fig. 14. Posterior ganglion of the left trunk of the same specimen (No. 27). 
No spirals or networks. Pyridine silver. X 488. 
Fig. 15 Interganglionic section of sympathetic trunk showing beaded, ap- 
parently degenerating, preganglionic fibers. Methylene blue. X 488. 
