PLATE 3 



EXPLANATION OF FIGURES 



28 Rat embryo, 15 days, Carnoy's 6-3-1. Gasserian ganglion geniculate 

 ganglion, and otic ganglion. Photograph, X 55. 



29 Rat embryo, 17 days, Carnoy's 6-3-1. Ganglion of the plexus tympanicus. 

 Photograph, X 130. 



30 Same. 



31 Rat embryo, 14 days, Carnoy's 6-3-1. Ramus palatinus VII; a marked 

 lateral extension near its anterior extremity indicates the anlage of the spheno- 

 palatine ganglion. Photograph, X 360. 



32 Rat embryo, 15 days, Carnoy's 6-3-1. A still rather diffuse, elongated 

 sphenopalatine ganglion. Photograph, X 92. 



214 



