SYMPATHETIC CELLS: NORWAY RAT 319 
TABLE 4 
Increase in diameters of cells and nuclei at three different ages 
DIAMETERS 
SEX AGE 
Cell Nucleus 
days 
J 1 17.19 9.85 
Q 1 16.61 9.60 
of 25 22.61 11.25 
Q 25 23.80 12.06 
of 134 27.00 13.70 
o} 134 24.70 12.85 
: } of 1B US 1:1.14 
Ratios between 1 day and 25 days......... 9 11.43 1:1.35 
: 5 ot Is dle tks) Slee 
Ratios between 25 and 194 days ........-..49 1:1.04 1: 1.06 
iyaaee nada acaat 
Zum FS ae 
SHIRE Zakk eeeee BGagaeaee Bae 
SEER EERE eee EE EEE 
| | EAB E Ramer tL 
ca aati ace sacs 
a Baieigtemieret tar EEE EH Age days 
0 20 50 100 200 200 300 400 
Chart 3 Based on table 3 and giving the computed diameters of the cells and 
their nuclei according to sex—on age in days. Wild Norway rat. The values 
for one female at 450 days are given in the chart. This case is not entered in 
table 3. At 200 days, as indicated by a break in the graph, the time unit is 
changed—one division being made equal to twenty-five days instead of ten days as 
heretofore. Males ————- Females ---------- 
