COMMISSURAL NEURONES 395 
except one operated frog and one normal control specimen. 
Both were injected with methylene blue. 
The ganglia of the control specimen were well stained and 
showed normal histological pictures on sectioning. 
Fig. 9 Section of a posterior ganglion from the same specimen (as fig. 8). 
Note the absence of spirals. Occasional short sections of darkly stained, 
apparently preganglionic, fibers can be seen in these preparations. Pyridine 
silver. X 650. 
The ganglia of the operated frog were also successfully stained 
and showed results which were identical with the results obtained 
on frogs of the first lot in which degeneration had continued for 
forty-six days or longer. Figure 10 represents a small section 
from the fifth or the sixth ganglion of this specimen. In the 
more anterior ganglia spirals, baskets, and preganglionic fibers 
