SYMPATHETIC CELLS: ALBINO RAT 307 
6. Taking the ganglion as a whole, the large or advanced cells 
may be present, though in very small numbers, even at birth. 
This number is slowly increased up to about the fifteenth day, 
after which the increase is more rapid. Correlated with. this 
is a decrease in the number of small cells which are transformed 
into the large cells. This transformation continues during the 
first year and probably throughout life. It appears to occur 
slightly earlier in the female. 
B. Based on the data for the ‘inbred’ strain 
7. The inbred rats ranged from 89 to 154 days in age. When 
the values for the diameters of the cells and of the nuclei were 
plotted on age, these values were greater for the males. The 
-males were also consistently greater in. body weight. When 
the values were plotted on body weight, the values for the females 
were in general above those for the males. In this case the 
females were older than the males with which they were compared. 
It seems probable that at like ages and like body weights, the 
females would show slightly higher values, but this may be 
merely an expression of precocity in this growth change in the 
females. 
8. When these cells in the inbred rats are compared with those 
in the standard animals, table 12, it is seen that while the nuclei 
differ but little in diameter, the cells in the standard Albinos 
have a diameter some 25 per cent greater than that found for the 
inbred cells. It is to be noted that this difference in diameter 
would make the volume of these cells in the standard Albino 
about twice that in the inbred, while the nuclei differ but slightly. 
This difference in the cells is definite, but the significance of it is 
not discussed here. 
9. The ratios of the diameter of the nucleus to that of the 
cell are in the inbred distinctly less than in the standard Albino, 
within the same age limits. Compare data in table 1 with those 
in table 10. 3 
10. The nucleus plasma ratios in the inbred are only about 
half as great as in the corresponding cells of the standard Albino. 
Compare data in table 2 with those in table 11. 
