524 
Da^^d H. Dolley 
of activity. It is not to be expected that the restiug cells of any type 
are of an exact uniform size but it is not possible to distinguish them 
from actmty in its early stages in the crayfish. There is, indeed, actual 
evidence from cells approaching exhaustion that the upward limits of 
size increase vary considerably and hence the lower limits must vary as 
well. But that this alone is sufficient to explain the results when these 
are considered in the light of the later process as weU as in the light of 
the Pmkinje cells, whose normal variations in the size of its resting type 
are more definitely defined, is not reasonable. 
The upset of the nucleus-plasma relation in prolonged 
activity. — The e^^dence points to the fact that the size of the cell body 
progressively increases without mai'ked fluctuations. This is not true of 
the nucleus. As may be seen from aU the curves, a sudden shift occurs at 
the sanie relative point in favor of the cytoplasm from the straight line 
of the constant relation just described for resting and early active types. 
From a cell body about eleven times larger than the nucleus, the next 
Table \TI. 
Average volumes and coefficients from fifty central sensory cells from all 
ganglia of same animal and gronped as Table VL 
Sumlier of Cells 
in Group 
Average Volnme 
of Cells 
Ayerage Volume 
of Xuclei 
Xucleusplasma 
Coefficient 
2 
42 768 ‘1 
4 039 
9.6 
3 
46 548 
3 686 
11.6 
4 
51 8901) 
3 932 
12.2 
4 
58 601 1) 
3 397 
16.3 
3 
60 787 
4 510 
12.5 
9 
67 192 1) 
4 811 
13.0 
2 
70 532 
4 785 
13.7 
2 
77 446 
4 607 
15.8 
1 
80 360 
4 845 
15.6 
4 
92 603 
5 472 
15.9 
4 
97 183 
5 870 
15.6 
1 
103 456 
6 783 
14.3 
O 
tj 
107 373 
6 250 
16.2 
2 
112 430 
5 794 
18.4 
2 
125 898 
7 633 
15.5 
1 
135 468 
8 800 
14.4 
1 
199 056 
6 783 
28.3 
1 
227 715 
8 360 
26.2 
1 
258 300 
10051 
24.7 
1) In Order, Figures 13—16 are taken from these gi'onps. 
