SYMPATHETIC CELLS: ALBINO RAT 289 
as age advances, as they are, respectively, 1 :1.72 and 1: 1.938 
for the youngest male and female; 1 : 2.11 and 1 : 2.15 at twenty- 
five days, and i : 2.34 for the oldest female. 
This increase is therefore most marked during the first twenty- 
five days. By comparing the progress from birth to twenty-five 
days with that from twenty-nine days to 365 days, one can - 
appreciate the rapid increase in amount of cytoplasm within the 
former period, as contrasted with the slower increase in the course 
Aco 
: rch 
a 
race 
COE 
eee : 
LI | 
Body weight—gms. 
ee 
125 15 175 200 250 
Chart 2 Based on table 2 and giving the computed diameters of the cells 
and their nuclei according to sex—on body weight. Males 
Females --------------- ‘ 
of a much longer time. It is fair to say, therefore, that the ratios 
change but slowly after the first twenty-five days. This agrees 
with the statement of Donaldson and Nagasaka (’18) on the 
ventral horn cells, that after twenty-four days the nucleus- 
plasma ratio increases but slowly. 
VARIABILITY WITHIN A GIVEN GANGLION 
The number of large cells examined in each ganglion is hardly 
great enough to permit of satisfactory statistical treatment, 
but it has been thought worth while to tabulate for each animal 
the range and average of the diameters of the cells and of the 
