262 E. VICTOR SMITH 



In size they range from 3 or 4 /x in diameter to those that occupy 

 nearly half of the cell. Figure 17 shows a large vacuole that oc- 

 cupied nearly half of the area of the cell. This cell contained two 

 other vacuoles of much smaller size. In this instance the vacuo- 

 lated condition could scarcely be due to fatigue since the hen was 

 caught early in the morning, and had no opportunity to exercise 

 between the time of its capture and the time of its death. The 

 hen was at least six years old and in a normally healthy condition. 



In two typical sections of the Gasserian of the old hen there 

 were 99 unipolar cells of which 2 had simple initial glomeruli. 

 Among the 99 were 5 bipolar cells showing stages from oppositi- 

 polar to unipolar; 7 cells had accessory processes, 20 had shng 

 processes, and there were 46 cells containing vacuoles. 



Accessory processes were present and varied in size irom those 

 visible only with the highest power of the microscope to those 

 readily seen with the low power. These accessory processes 

 usually terminated in small bulbs and none were observed to 

 extend beyond the pericellular capsule (fig. 19). Occasionally 

 a cell was observed in which minute processes with pin-head termi- 

 nations issued from the main process near its jtinction with the 

 cell. 



The fenestrations of cells in the Gasserian ganglion varied 

 from small perforations of the periphery of the cell, to an exten- 

 sive network of anastomosing processes occupying more than half 

 of the space within the capsule. Figure 20 (fen.) shows one of the 

 simplest fenestrations consisting of a single perforation at the 

 base of the slender centrally going process. An accessory process 

 arises near the fenestration. In fig. 21 there are protoplasmic 

 slings (slg.) at the base of the process and also at the opposite 

 pole. Although extending some distance from the cell wall, they 

 do not pass beyond the capsule. Figure 22 represents a cell in 

 which the loops of protoplasm are near or associated with the 

 main process. In figure 23 there are protoplasmic loops on the 

 pole opposite the main process. The protoplasmic strands dimin- 

 ish in size as they recede from the cell body so that near the 

 capsule the fibers become very fine. In this case the body of 

 the cell occupies about one-third of the space within the capsule. 



