I02 



HUNTER. 



[Vol. II. 



Besides the granules first described, small groups of refrac- 

 tive bodies — probably pigment granules — are found in some of 

 the cells. Vacuolated spaces are frequent, but are so much 

 increased in size by poor preservation that I am inclined to 

 believe them artifacts. Such spaces may be filled with the 

 hyloplasm of Nansen, Montgomery, and others. 



A fibrillar or reticular structure for the nerve cell could not 

 be absolutely proved, although the fibers from the cell process 

 can be followed for some distance into the cell-body. The fre- 

 quent arrangement of the granular portion of the cell into a 

 sort of network suggests a reticular framework of fibers as 

 indicated by Cajal and Van Gehuchten in the vertebrate nerve 

 cell, or Pfliige in invertebrates. 



The nerve cell is surrounded by a thin membrane and in the 

 large ganglion is surrounded by a capsule of fine fibers (neuroglia 

 of authors, or connective-tissue sheath). This capsule can best 

 be seen in cells that are somewhat shrunken. 



The nucleus is irregular in contour and appears circular, 



ovoid, kidney-shaped, or, in ex- 

 treme cases, cup-shaped. Rarely 

 the invagination has appeared to 

 cut the nucleus into two distinct 

 parts. Never has the nucleus 

 been found to occupy a central 

 position in the cell ; it is always 

 excentric, and frequently situated 

 in an outpocketing of the cell. In 

 unipolar cells it is usually found 



Fig. I. — Ganglion cells. Cynthia. Centro- 

 some and sphere; nucleus at axis-cylinder at the OppOsitC end frOm thc CCll 



end of cell. Von Rath. Iron-haen.atoxylin. pj-QceSS ; but iu many CaSCS it is 

 Camera drawing, ^j x oc. 6 (Zeiss). '^ ' J 



forced by the action of the cen- 

 trosome close to the axis-cylinder end of the cell (see Fig. i). 



The nuclear membrane is very prominent and stains deeply 

 with haematoxylin and basic analins. The nuclear process of 

 Schultze ('79), Rhode ('96) was found, but it seemed to be an 

 artifact. Binucleated cells were rarely seen. 



In large cells the chromatin exists in small particles collected 

 against the nuclear membrane and scattered through the nucleus. 



