1911] Nervous System of Corydalis 227 



(c) Those passing from the periphery into the nerve trunks 

 and having extensive arborizations in the ganglia to which they 

 are connected and then passing on to another ganglion with 

 arborizations in it. Only a few of such fihers were distinguished 

 one in connection with the Sth ganglion was the clearest case. 

 A nerve fiber from the periphery was easily traced into the 1st. 

 lateral trunk, a branch from this fiber was given off in the ceph- 

 alic and lateral region of the ganglion, this fiber could be traced 

 into the " punktsubstanz " of the nerve center, some of its arbori- 

 zations ending on the same side and one branch was traced to 

 the cephalic region of the other side, while the main fibers passed 

 up the connective and ended by arborizations in the "punkt- 

 substanz" of the ganglion next above chiefly on the same side 

 in the caudal region. 



ABDOMINAL GANGLIA STUDIED IN SECTION. 



Individual cells and fibers were not so easily traced by this 

 method, but general masses of fibers and the location of cell 

 groups were determined. 



All of the ganglia, connectives and nerve trunks are inclosed 

 in a chitinous envelope which in many cases is very close to the 

 nervous tissue but usually separated, by neuroglia cells. This 

 envelope is especially thick about the connectives just before 

 and just after they enter a ganglion, it appears as a uniform 

 mass in section with large and smaller openings where trachea 

 penetrate it. 



In places under the chitin of the ganglia, especially on the 

 dorsal side, there are large spaces with little or nothing in them 

 but delicate neuroglia networks. The trachea radiating in the 

 chitin covering the connectives and ganglia have already been 

 referred to; as stated in a previous paper large branches and 

 fine tracheoles run to the nervous system and are distributed 

 to all centers and their branches. These are superficial or run 

 in the chitinous sheath, and the deep, supplied in part by the 

 superficial twigs but chiefly by larger special branches and 

 enter the ganglion and connectives. In these connectives it 

 is easy to see numerous openings, large and minute between the 

 masses of nerve fibers, and in cross section the air tubes are 

 shown to be fully as numerous as one would expect from a 

 study of surface views where all the trachea were made to show. 

 Tracheal tubes within the ganglia are particularly noticeable 



