PLATE 4 



EXPLANATION OF FIGURES 



33 Rat embryo, 17 days, Carnoy's 6-3-1. A late stage showing the spheno- 

 palatine ganglion in contact with the Gasserian ganglion. Photograph, X 55. 



34 Pig embryo, 15 mm., Zenker's fluid. Diffuse cell strands, extending out- 

 ward from the ramus palatinus VII. Photograph, X 175. 



35 Pig embryo, 17.5 mm., Zenker's fluid. A fairly large but still exceedingly 

 diffuse sphenopalatine ganglion. Photograph, X 80. 



36 Rat embryo, 17 days, Carnoy's 6-3-1. Developing lingual ganglia. 

 Photograph, X 55. 



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