316 “| SCHI PING 
B. In relation to body length 
Following the procedure just used, the condensed data have 
been arranged to show the relations of the cell diameters accord- 
ing to increasing body length, and are given in table 2. There 
are thirteen groups for the males and eleven for the females. 
The corresponding graphs are plotted in chart 2. According 
TABLE 2 
Giving according to body length the computed diameters of the largest cells and nuclei 
in the superior cervical ganglion of the Norway rat. Sexes separated. Data 
condensed 
MALE FEMALE 
Minti joey. Computed diameter Computed diameter oa Nuamibe 
eee VETERE Nucleus Cell Cell Nucleus NENA oF ORES 
mm. Me iu Me be mm. 
1 53 9.9 17.2 16.5 9.6 50 1 
2 71 12.5 21.9 22.5 12.5 71 3 
1 84 1358 24.4 23.9 12.1 103 3 
2 104 12.6 23.6 23.4 12.8 114 1 
3 112 12.3 23.3 24.6 12.8 123 5 
3 144 12.9 25.5 24.7 12.7 130 3 
5 167 13.1 26.8 PAR Fi 12.9 146 3 
5 189 13.3 26.4 27.3 13.2 184 12 
6 209 13.5 29.8 28.3 12.8 202 6 
3 214 14.8 32.6 28.9 13.5 213 2 
5 225 13.5 32.6 31.5 1350 222 3 
4 233 13.8 32.4 
3 251 113} 7/ 31.1 
to the graphs, there seem to be two periods in which the diameter 
of the cell is showing a rapid growth; one-period at a body length 
of about 80 mm. and the other at a body length of about 200 mm. 
Without entering into the details, it will be sufficient to point 
out that both periods are those in which the body weight is 
increasing rapidly in relation to the body length, and it is prob- 
ably the influence of the body weight which appears in the 
eraphs. At the same time there is no sex difference to be seen 
in the diameters of either the cells or their nuclei. 
