1911] Nervous System of Corydalis 253 



one. Some tracts were found distributed to the next center 

 above as well as the nerve center to which their nerve trunks 

 were connected. Others were found passing in to the ganglion 

 to which the trunk was attached but giving no branches and 

 passing on up to end in the next above or higher up. 



A number of fibers apparently sensory were found passing 

 through a number of ganglia without branches. These were 

 often larger strands and although not traced as far as the head 

 there was no reason to doubt that some of them were that long. 



Sensory fibers and tracts were however traced into the large 

 head ganglia and were found distributed to all portions of the 

 fibrous mass. Sensory tracts were easily traced in connection 

 with the ocular trunk, connecting it with the special lateral 

 masses of fibrous substance. 



3. Motor tracts could be traced as having their origin from 

 cells in the ganglion to which the motor trunks were connected. 

 Motor fibers could be traced out of the ganglia some distance 

 but were not followed in as much detail as the sensory. 



4. Association and descending tracts were recognized in 

 all centers and at all levels of variable extent. Probably some 

 of these were motor tracts. 



5. Cells of many sizes were found in all centers. The 

 largest and the smallest functional nerve cells seemed to be for 

 association, those of the former sort having extensive aboriza- 

 tions, the second kind being much less extensively branched. 

 Many of the medium sized cells were found to be motor. The 

 general type was uni- or bipolar with one long branch which 

 might run out for a considerable distance. Some association 

 cells seemed to be bipolar with long processes running out in 

 both directions. Some association cells seemed to be uni- or 

 bipolar with all the branches coming off and branching again not 

 far from the cell. A few multipolar forms were seen. 



Neuroblasts were found to some extent in all ganglia, but 

 great masses of them were especially noticeable in the brain. 



Neuroglia networks filled in places under the chitin where 

 there were no nerve cells and also formed more or less of a net- 

 work in the regions where they were present. 



6. Cells were grouped about the central fibrous mass in all 

 of the ganglia. In the abdominal they were found to be espec- 

 ially abundant in the caudal and ventral regions, although the 

 cell masses extended out laterally in all, and there were 



