1911] 



Nervous System of Corydalis 



223 



NERVE TRACTS IN ABDOMINAL GANGLIA. 



(Figs. 1 and 2.) 



By means of methylene blue preparations it was possible in 

 some more deeply stained specimens to trace the main tracts of 

 fibers within the ganglia and within the connectives and in 

 lighter stained specimens the distribution of special tracts 

 and even individual fibers. At times the cells stained as well 

 as the fibers at other times only fibers were colored. 



Fig. 1. Figure of the 7th and 8th abdominal ganglia from methylene blue 

 preparation. Dorsal side. A few nerve cells are shown in black. The chief nerve 

 trunks show with their fibers. The central "Punktsubstanz" of the ganglia dotted. 

 Some of the larger tracheal tubes shown as thick solid black lines. 



The caudal end is down in this and the following figures, x.30. 



Fig. 2. Sixth abdominal ganglion from ventral side. Methylene blue. x.30. 



Stained or unstained, the central region of each ganglion is 

 more opaque or darker, due to the nerve fibers crossing and 

 terminating in this region. This forms on each side a central 

 body made up of two oval masses more or less fused into one at 

 the middle line, the "Punktsubstanz" of some authors. The 



