SECTION THROUGH A POSTERIOR SPINAL GANGLION AND SPINAL CORD OF A CHICK EMBRYO, 

 SEVENTH DAY, SHOWING CELLS IN THE POSTERIOR SPINAL GANGLION WITH TWO PROCESSES, ONE 

 PASSING OUTWARD IN THE SENSORY NERVE, THE OTHER PASSING INWARD AND ENTERING THE SPINAL 

 CORD X 190 DIAM. 



PLATE XI. 



