The Morphology of Fuiictioiial Activity in thc (ianglion Gells etc. 507 
The variations in the absolute and relative sizes of the cell and its 
nucleus and in the nucleus-plasma relation therefrom resulting. 
The source and extent of the data. — Since this phase of 
activity is in the crayfish the inost significant one and since the results arc' 
necessarily niore thancommonly exposed to criticism on purely mechanical 
and technical grounds as well as on those of the personal equation, the 
source and extent of the data in full will be outhned. The figures are 
too vast to publish in detail and those that are publishcd represent less 
tlian one-half of those obtained. To obviate the objections named, a 
great number of measurements is demanded but this is not enough unless 
the general trend and course of the results from different animals be 
uniform and constant within reasonable limits. These requirements, 
it is feit, are sufficiently met. 
Eight hundred and forty-nine cells have been measured and their 
volumes and nucleus-plasma coefficients calculated. This does not in- 
clude over one himdred preliminary oncs in estabhshing the technic and 
in the early attempts to separate the different types. TI e first abdominal 
Table II. 
Centro-peripheral motor cells from the first abdominal g'anglion of an 
nndisturbed animal (Experiment 10). 
1 
Diaineters of Cell j 
Diameters of Xucleus 
Volume 
of Cell 
Volnme 
of Nucleus 
Nucleusplasma 
Coefficient 
42 X 36 X 35 1 
19 X 13 X 18 ' 
53 920 
4 446 
11.1 
58 X 27 X 35 
21X15X18 , 
54 810 
5 670 
8.7 
48 X 30 X 40 
19 X 15 X 22 
57 600 
6 270 
8.0 
54 X 29 X 40 
22 X 14 X 20 
62 640 
6160 
9.2 
49 X 41 X 40 
18X17X17 
80 360 
5 202 
14.4 
43 X 42 X 45 
19 X 16 X 17 
81 270 
5168 
14.7 
54 X 43 X 35 
19X15X13 
81 270 
3 705 
20.9 
54 X 44 X 40 
18 X 16 X 20 
95040 
5 760 
15.5 
58 X 41 X 40 
21 X 15 X 15 
95120 
4 725 
19.1 
57 X 47 X 40 
22 X 16 X 18 
107 160 
6 336 
15.9 
58 X 39 X 55 
22X16X24 
, 124 410 
7 448 
15.7 
65 X 45 X 50 
20 X 16 X 20 
^ 146 250 
6 400 
21.9 
54 X 36 X 70 
22 X 20 X 25 
147 420 
11000 
12.4 
72 X 42 X 50 
23 X 18 X 20 
151 200 
8 280 
17.2 
81 X 53 X 45 
28 X 19 X 20 
, 193 185 
1 10 640 
17.2 
73 X 59 X 45 
22 X 19 X 22 
193 815 
i 9196 
20.1 
