262 FISH. [Vol. X. 



shape to a distinct fusiform cell with the long axis extending 

 perpendicularly to that of the endymal cells, or in other words 

 more or less parallel with the periphery of the neuraxis. They 

 are always characterized by the presence of more than one 

 process. These processes were always found to extend parallel 

 with or somewhat towards the periphery. 



Between the endymal cells of the ental boundary and the 

 dendritic cells of the ectal boundary of the cinerea, there exist 

 intermediate forms which suggest very strongly that they, in 

 the course of time, will develop into these ectal cells. The 

 intermediate cells have only one process, which is of greater 

 or less length according as the cell is near or far from the 

 alba ; this process very rarely divides before reaching the alba 

 and these branches, although they may be traced some distance, 

 are found to have a general trend toward the periphery ; smaller 

 branches are given off at intervals, and these may again sub- 

 divide. At the first bifurcation, the angle of divergence is 

 very great, generally ninety degrees on even one hundred and 

 eighty degrees ; the other divisions are usually at acute angles, 

 there being more or less of an enlargement at the point of 

 bifurcation. The processes are comparatively smooth, the 

 central end of the cell remains smooth and blunt and the 

 neurite or axis-cylinder process does not spring from that end 

 of the cell body. In various preparations, I have been able to 

 detect a finer branch arising from one of the processes not far 

 from the point of bifurcation or from the peripheral end of the 

 cell itself. Figs. 53 ;/, 44;/, which I believe to be the neurite, 

 because it could be traced a greater distance than the other 

 processes ; there were fewer branches given off from it and 

 these were likewise of finer caliber than the neighboring 

 dendrites and left the main stem at greater angles. In some 

 instances the neurites appear so fine and delicate, that it quite 

 naturally suggests the question that they, like the fibrin 

 filaments of the amphibian blood, may have been overlooked 

 by many because of their extreme delicacy. 



The changes undergone by the cells of the spinal ganglia 

 from the early " oppositipolar " condition to the unipolar have 

 been well demonstrated by von Lenhossek and others. Fig. 52, 



