PLATE 5 



EXPLANATION OF FIGURES 



20 Bipolar cell with fenestration and accessory process near the central 

 process, from the Gasserian of a chick. X 800. 



21 Cell from the Gasserian ganglion of an old hen, showing slings about the 

 axone and also at the opposite pole. X 800. 



22 Cell from the Gasserian ganglion of an old hen with slings and protoplasmic 

 strands about the axone. X 800. 



23 Cell with a nest of protoplasmic loops on the pole opposite the main process, 

 from the Gasserian ganglion of a six-year-old hen. X 800. 



24 Bipolar cell with protoplasmic loops and an accessory process near the cen- 

 tral process, from the Gasserian ganglion of a six-months-old chick. X 800. 



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