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FRED W. STEWART 



of the spinal ganglion cell type ; 4) they resemble similar elements 

 in other nerve trunks considered in this study where subsequent 

 observation has shown the cells to be sympathetic, and they are 

 to be found in regions of the vagus where other techniques have 

 indicated sympathetic neuroblasts. 



Fig. 3 Rat embryo, 15| days, vom Rath's technique. Neuroblasts of vagus 

 trunk, below l>ifurcation of the bronchi. 1, 2, 3, types of cell, intermediate be- 

 tween elongate accompanying cell and definitive neuroblast. Projection draw- 

 ing, X 500. 



As regards the distribution of the two types, it may be remarked 

 that the large-cell type lends to bo found along the main vagus 

 trunk, sometimes, as has been said, in a continuous row from the 

 ganglion nodosum to the origin of the interior laryngeal nerve, 

 ;ii oilier times more scattered, There is a quite constant aggre- 



