PLATE 1 



EXPLANATION OF FIGURES 



1 Typical unipolar cell from a spinal ganglion of a six-months-old chick. X 800. 



2, 3, 4, 5 Bipolar cells from spinal ganglia of the adult chick. Figure 5 shows 

 the protoplasmic network of the cell body and of the processes. Note in the differ- 

 ent cells the capsule, capsular nuclei, and the smaller size of the central process. 

 X 800. 



6 Bipolar cell in which two processes have just come together. Observed in a 

 spinal ganglion of an adult chick. X 800. 



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