PLATE 4 



EXPLANATION OF FIGURES 



17 Diagrammatic reconstruction illustrating topographical relationships of 

 sphenopalatine, otic, and submaxillary ganglia to superior cervical ganglion and 

 cranial nerves, 156 hour embryo of chick. 



18 Sagittal section through sphenopalatine ganglion, 168 hour embryo of 

 chick. X 90. 



19 Sagittal section through submaxillary ganglion, 168 hour embryo of chick. 



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