EXPLANATION OF FIGURES 
All figures are of abdominal ganglion cells of Cambarus. Figures 1 to 16 
show the distribution of the neurofibrillae and the origin of the intracellular 
axone. Mitochondria are shown in figures 9 to 12. Photomicrographs and 
drawings, except figure 14, were made by the author from sections 4y in thickness, 
except figure 13, from a section 7u in thickness. Figure 14 was drawn by Mr. 
Streedain, to whom acknowledgment is due for valuable suggestions. 
ABBREVIATIONS 
a, intracellular axone n, nucleus 
c, clear spaces, artefacts (?) o, origin of intracellular axone 
m, mitochondria tr, trophospongium 
N, Nissl bodies un, undulations in intracellular axone 
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