SYMPATHETIC CELLS: NORWAY RAT BA 
' The ratio of increase is a trifle higher for the male Norway, 
as was found for the male Albino; indeed, the relations of the 
ratios according to sex are strikingly similar in the two strains. 
As will be seen by comparing the ratios (1 to 19 days) for the 
Norway with those (1 to 20 days) for the Albino, the rate of 
increase is apparently ten times as great in the Norway as in 
the Albino. This will be discussed later. 
The nucleus-plasma relation 
In determining the increase in volume of the cytoplasm in 
relation to that of the nucleus, the computed diameters of the 
TABLE 9 
Giving the average diameters of the cells and nuclet according to body weight. The 
nucleus-plasma ratios based on these diameters are given in the last column. 
Data condensed. Superior cervical sympathetic ganglion. Norway rat 
| 
MEAN ; DIAMETERS 
NUMBER OF BODY WEIGHT Kany NUCLEUS-PLASMA 
CASES RANGE Gin ait ees. RATIOS 
grams Me [a 
16 6- 38 22.2 22.3 12.1 3553 
16 41-100 65.9 25.0 12.8 12624 
8 104-150 121.4 26.8 13.0 IOI Le. 
16 152-195 175.4 27.9 13.1 IS Bile 
16 206-250 226.6 30.1 13.5 Teel O20 
5 - 259-290 270.1 32.7 13.7 1:12.4 
8 311-402 346.1 32.2 13.8 pestle 6 
cell and of the nucleus have been condensed according to body 
weight and arranged in table 9. By subtracting the volume 
of the nucleus from that of the cell, the volume of the cytoplasm 
is obtained, and the ratios between the latter and the volume 
of the nucleus are given in the last column of table 9. This 
table shows that the increase of the cytoplasm is progressive, 
except in the last group. 
In general it may be said that for each 50 grams of increase 
in body weight, the increase in the ratio is one unit. For a 
body weight of 22.2 grams (about twenty-five days of age) 
the ratio is about one-half that for the oldest group with a body 
