326 CHI PING 
Table 8 gives the number of these large cells recorded in the 
ganglion for each sex during the first twenty-five days. 
There are a few advanced cells and a few comparatively large 
cells at birth, or just after, but the number is strikingly small: 
By the end of the fifth day there is a great increase in number— 
about twenty times that of the preceding stage. Then the 
TABLE 8 
Increase in number of large and advanced cells, 16 to 25 w in diameter, during the 
first twenty-five days of age. The ratios for the increase in the total number for 
both sexes between one day and nineteen days stand at the foot of the last column. 
Superior cervical sympathetic ganglion. Norway rat 
SEX AGE BODY WEIGHT NUMBER OF LARGE CELIS 
days grams 
Si 1 5.9 22 
g 1 5.6 * 24 
oh 5 12.7 416 
g 5 13.4 515 
rot 10 13.6 417 
a 10 13.5 530 
of 15 1726 833 
2 15 13.6 827 
oe 19 31.1 3, 066 
Q 19 31.1 3, 084 
Q m4) 28.5 3, 074 
of 1 :'139.3 
Ratios between and 19" days. ot2. 2 os. .c so Se ees 3 1: 129.0 
increase is slow and slight until the age of fifteen days. At this 
time the cells again show a considerable increase in their number, 
and this is still more marked at nineteen and twenty-five days. 
Thus the greatest increase in number of the large cells is between 
one and five days, and again between fifteen and nineteen as 
in the case of the Albino (Ping, ’21, table 6). 
