PLATE 1 
EXPLANATION OF FIGURES 
The drawings are, with the exception of figs. 14 and 15, free hand sketches from 
pyridine silver preparations of the spinal ganglia of dogs. Figs. 14 and 15 are 
camera lucida tracings from a human sciatic nerve, the section from which fig. 
14 was drawn having been prepared by the Pal-Weigert method, and that from 
which fig. 15 was drawn by the Cajal method. 
1 Small and medium sized cells with non-medullated axons. Non-medul- 
lated fibers black, medullated fibers gray. 
2 Bifurcation of a medullated fiber and four non-medullated fibers. The 
latter are fine and black with a triangular expansion at the point of bifurcation, 
the former is large and grey (in the preparation light yellow) with a constriction 
at the point of bifurcation. 
3-4 Collaterals ending in end bulbs. 
5-6 Cells whose axons are split to form a plexus. 
7 <A cell whose axon arises by three roots which form a plexus out of which 
the axon is formed 
8-9 ‘Fenestrated’ cells. 
10 Multipolar cell. 
11 Cell of Dogiel’s type xt. 
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