1911] Nervous System of Corydalis 229 



level there are nerve fibers seen between the cells on the ventro- 

 lateral margins of the ganglion and fibers connected with these 

 regions of the nerve center join the bundle from the cells on the 

 dorsal side, on the ventral median side of the ganglion, while a 

 third runs in from these cells into the central part of the longi- 

 tudinal fibers. We have then at this level three transverse 

 bundles of fibers crossing from the lateral cell groups, a dorsal, 

 a ventral and median and a little farther along we have also a 

 bundle of fibers running across the section but from the dorsal 

 to the ventral side and uniting to some degree with the three 

 right and left commissures. Other little branches from these 

 main ones and other tracts from the lateral cell groups also 

 invade the longitudinal bands from the connectives. 



A little above this level again on the ventral side a single 

 layer of cells appears in the middle line and no cells are seen on 

 the dorsal side except laterally. 



A little above this, the large ventral trachea enter passing 

 through the cell layer and breaking up into numerous branches. 

 The central fibrous mass of the ganglion is largely made up of 

 longitudinal strands in all levels so far and besides the com- 

 missures mentioned there are usually a number of fibers crossing 

 irregularly both dorso-ventrally, laterally and obliquely espe- 

 cially at about this last level. None of them are large and the 

 great mass of fibers remains longitudinal. It is at about this 

 level that the ventral nerve trunks come off from the lateral 

 and ventral sides of the ganglion from the central part of the 

 latero-ventral cell mass, just before the tracheal trunks are 

 reached. Fibers from this trunk may mingle with the cells of 

 this region and are also continued into the central mass of 

 fibers of the ganglion. 



Beyond this point the cells become thin again especially 

 ventrally and also laterally, the central thickest part of the 

 ganglion is now reached and the fibers form a rather large dense 

 mass. Longitudinal ones may still be seen mixed in with 

 numerous lateral and transverse strands all bound up together 

 into a dense fibrous mass with no very marked special tracts or 

 strands except for quite a well marked short broad median 

 commissure of fibers connecting more intimately the two 

 already well fused masses of each lateral half of "punktsubstanz." 



Slightly beyond this, the cells have about disappeared, only 

 a few remaining at the dorso-lateral edges of the ganglion. 



