82 CHARLES BROOKOVER 



these cells and have not in my hands inpregnated the olfactory 

 fibers or cells, they are much preferable to Golgi preparations. 

 In some cases neurofibrils are shown (fig. 17), thus indicating 

 that they are functioning neurones in the adult fish. There are 

 nerve processes ending on the surface of some of the cells or near 

 them (fig. 17). It is difficult to say whether these are axones 

 or dendrites. This is often the case in the symphathetic system, 

 as for instance in the myenteric plexus (Auerbach's plexus) of 

 the small intestine of mammals. In the case of the processes of 



fcVtvav.naHal. ° % 



Fig. 16. Golgi preparation of adult Amia cut as above. Shows fibers of the 

 nervus terminalis in the adult nasal capsule following an artery which is indicated 

 by broken lines. X 80. 



the nervus terminalis, they behave in the Cajal treatment like 

 axones rather than dendrites. Cajal preparations and hema- 

 toxylin staining show that many of the cells are bipolar and 

 spindle-shaped, but some of them are stellate with three or more 

 processes. The third type comprising about one-half of the total 

 number of cells, is fusiform in shape. So far as could be deter- 

 mined, these latter have only one nerve process that tapers grad- 

 ually from the cell body like a dendrite. These are the three 

 types of cells usually described in sympathetic ganglia. 



