290 CHI PING 
nuclei, entering these according to age as in table 1. In a fairly 
graded series of measurements we may expect to find the average 
for the series close to the mean of the limiting values, and a little 
study of table 4 shows this to be the case. 
MORPHOLOGY OF THE LARGE CELLS 
Plate 1. (Figures 1 to 7) 
In considering the morphology of the cells in the superior 
cervical sympathetic ganglion, it must be recalled thatfrom its 
cells arise several classes of fibers—pupillodilator fibers, motor, 
vasomotor, pilomotor and secretory fibers. It is a priori possible, 
TABLE 3 
Increase in diameters of cells and nuclei from 25 to 365 days 
GAIN 
- DIAMETERS SEX 25 DAYS 365 DAYS 
Absolute Percentage 
ML Me a 
nen J 26.59 29. 60 3.01 11.3 
CS ee peatscooreyae chee a Penene elie 9 27.26 31.38 4.12 15.1 
see o 12.60 13.45 0.85 6.31 
i CR ME UURESE fe Wag Park 9 12.65 13.54 0.89 6.58 
that the several functions thus indicated are correlated with cell 
characters that are distinctive, but at the moment we have 
nothing to contribute to the solution of this problem. 
When young, the cells of the superior cervical ganglion are 
very similar in appearance to those of the young spinal ganglion, 
and practically all of them are more or less elongated with 
processes at one or both ends. Each cell has a large clear nucleus 
surrounded by a little cytoplasm. This cytoplasm is homogene- 
ous in structure and stains uniformly. Those coarse Nissl 
bodies, which are found in the cells at later ages, are totally lacking. 
Usually each nucleus has a single, dark stained, nucleolus, but 
occasionally there may be found more than one. ‘This condition 
continues from birth to five or six days of age, when differentia- 
tion begins in the cytoplasm of these immature cells. 
