PLATE 1 



EXPLANATION OF FIGURES 



22 Rat embryo, 15 days, Carnoy's 6-3-1. Neuroblasts massed along the 

 internal carotid nerve. Photograph, X 105. 



23 Rat embryo, 15 days, Carnoy's 6-3-1. Large aggregate of neuroblasts 

 along vagus trunk, level of cardia. Photograph, X 65. 



24 Rat embryo, 15 days, Carnoy's 6-3-1. Ganglion cells continuous with 

 those of the ganglion nodosum, as far caudad as the origin of the inferior laryngeal 

 nerve. Photograph, X 50. 



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