1911] Nervous System of Corydalis 235 



groups appear one on eac^ side laterally and a small ventral 

 group. (Fig. 1-3, Plate I). These masses at the sides of 

 both large and small cells are at least three deep. The three 

 groups a little farther along become united by a single row of 

 cells which farther up becomes double layered and all the cell 

 groups are not distinguishable in the single mass. There are 

 also at about this level as a part of this mass a few cells in the 

 mid-ventral line between the bundles of fibres of the connectives. 



Farther up, the connective tracts are less clearly all longi- 

 tudinal fibers and the lateral part of the nerve cell mass gives 

 way for the entrance of the first or most cephalic of the three 

 nerve trunks, the fibers of which pass into and mingle as trans- 

 verse and dorso-ventral hbers in the connective tracts. The 

 fibers of this nerve are very extensive and may be followed into 

 the center of the ganglion, both dorsally and ventrally. Fibers 

 from the ventral cells on either side of the ganglion enter the 

 center of each lateral half from below and are there lost and 

 partly pass into the nerve trunk. Fibers from the cells in the 

 mid-ventral line, which cells form a wedge shaped mass at 

 higher levels between the connective masses, run to the dorsal 

 side of each of these masses of longitudinal fibers, and from 

 here circle about to become associated with the fibers of the 

 nerve trunks and with other more median strands on each side 

 of the ganglion and with the strands described above which 

 come from the ventral mass. Slightly beyond this part and 

 nearer the center of the ganglion the two central masses of 

 fibers or connective masses become fused together, the cells 

 disappear and commissures, a dorsal, a ventral and a median, 

 connect to some degree the sweeps of fibers already described. 

 (Fig. 4, Plate XV, just above this level.) 



Farther down, two commissures, a median and a dorsal are 

 seen but numerous fibers cross the middle line at many levels 

 and angles. Farther on but one commissure can be noted, 

 a ventral, but many other fibers cross at different angles and 

 the whole lateral portion of the ganglion is a dense system of 

 complicated interlacing fibers having a dense meshwork. On 

 the lateral part of each ventral half the fibers stain darker, 

 probably due to more numerous fine branches in this region 

 and on the dorsal median line a little wedge shaped group of 

 cells makes its appearance, the only cells of this region. These 

 send their fibers through the center of the ganglion to the ven- 



