62 JoURNAL OF COMPARATIVE NEUROLOGY. 
TABLE Ib. 
Showing Percentage Values of the Areas of the Cross-Sections of the 
Dorsal Nerve Roots as Given in Table I@. The Greatest Area in 
each Series is taken as 100%, and the other Areas calculated 
from this as a Standard. 
Percentage Value of Areas. 
No. of Spinal KOLLIKER INGBERT STILLING 
Segments Male Male Female 
if 6.0 2.5 5-9 
II 53-1 45.6 27-2 
= Ill 39.8 41.8 27.5 
= IV 270 39.8 252 
‘ V 54.8 55et 4l.1 
oS) Wali 85-5 90.9 79.9 
VII 100.0 92.3 68.1 
VIII 81.4 100.0 72.6 
1 39-8 35-2 45-5 
II 21.8 18.4 24.7 
Ill 14.1 19.1 17.2 
IV 14.1 17.6 1352 
i) V 15.3 13 3 14.1 
4 VI 24.5 11.5 13.6 
i) VII 24.5 19.1 13.2 
S VIII 24.5 13.7 15.7 
IX 23.0 leit 15.4 
x 25.3 16.8 14.8 
XI 26.0 17.8 1720 
XII 24.5 24.4 15-9 
ci I 30.9 34.2 22.1 
Ss I 33-5 43-4 27-1 
g Il 39.8 49-5 46.5 
5 IV 56.5 7.3 63.2 
V 63.6 62.6 61.4 
I 100.0 67.3 71.7 
‘S II 56.5 YS 100.0 
9 Ill 16.4 23.0 45-5 
n IV 6.7 7.8 22.4 
V Bee 25 8.5 
Co 
3S I 5 6 19) 
IV. Determination of the Number of Nerve Fibers im the 
Dorsal Roots of the Spinal Nerves of Man. 
The further significance of the areas of the cross-sections 
of the dorsal roots can only be fully appreciated when the num- 
ber of fibers which these roots contain has been determined. 
As before mentioned, there is, up to the present time, on record 
