540 HENRY H. DONALDSON AND G. NAGASAKA 
TABLE 6 
Giving in micra the mean values for the computed diameter of the cell body and of the 
nucleus of cells from the ventrolateral area of the ventral horn by combining the 
data as they appear in tables 4 and 6 
CELL BODY MEAN ‘COMPUTED 
MEAN BODY WEIGHT NUCLEUS MEAN DIAMETER 
DIAMETER’ 
grams 
1S 23.9 12.9 
25.1 24.2 113341 
42.9 25.3 13.4 
59.1 P25) 18) 14.3 
81.5 28.2 1522 
114.8 29.6 15.8 
118.7 28.3 15.4 
151.4 30.4 15.8 
179.4 29.5 15.1 
231.0 28.9 16.2 
249.8 29.2 16.0 
315.2 29.6 15.3 
RUAGLOS Sse se cere im 1:1.2+ 1:1.2-— 
Table 7 enables us to compare the average diameters of the 
largest nerve cells in the spinal ganglion of the seventh spinal 
nerve with the corresponding average diameters of the largest 
myelinated fibers at C in the dorsal nerve root, and at A in the 
spinal nerve just distal to the ganglion. Looking at the column 
TABLE 7 
Comparing the diameters of the spinal ganglion cells in albino rats of different sizes 
with the diameters of the corresponding dorsal root fibers and of the fibers just distal 
to the ganglion. In the last two columns are given the respective ratios. Data 
condensed from tables 2 and 3 
AVERAGE AVERAGE 
eee mae Cee RATIOS 
BODY WEIGHT AGE cetits In |_OF DORSAL | pispar To 
SPINAL oe Gy THE GAN- 
GANGLION at(C)  |grion ar (A)| C:Sp. G 
grams days BL 7 BL 
29.0 24 2aE0 10.8 10.7 L218 
85.1 56, 29.8 13.0 12.9 2829 
149.2 105 33.4 15 se¢7 15.8 12s 
264.2 267 38.1 18.3 18.1 12508 
atlogee sees eG Shy isa 7 
