— 211 — 
stance. cec Epithelium surrounding the central canal. 
wpr Nervous process. nbr Sidebranch of the nervous 
process. mhr Main branch of the mixed process from 
Igc, bri, hr^ Branches given off from the same process. 
nt Obhquely transsected nerve-tube from the ventral 
nerve-root (vny\). (Fixed in saturated aquous sokition of 
picric acld, stained according to Heidenhain's hæmo- 
toxylin method). 
Fig. 96. (Magnified 950 diameters; Zeiss. Hom. im. Vis^ i)- The 
ganglion cell Igc of fig. 95, more lighly magnified. mp Mixed 
process. pp Protoplasmic process. v, v' Transsected, 
lightly staining tubes (probably bundles of primitive tubes). 
cm Sheath enveloping the cell. a Cavity, filled with a 
lightly staining, reticular substance, between the sheath 
and the protoplam of the cell. 
» 97 — 99. (Magnified 950 diameters; Zeiss. Hom. im Vis» i-) 
Transsected ganglion cells of a spinal ganglion, n, Nuclei 
situated, generally, inside the sheath enveloping the cell. 
Nucleus situated in the sheath of a process. gr Dark 
granules, occurring inside the sheaths (possibly artifical 
products in the sections). v Transected, lightly staining 
tubes (probably bundles of primitive tubes), x Hyaline 
organ (or cQ\\t) situated in the surface of the cell. 
N Elongated nucleus situated in this organ. JV' Another 
nucleus (.?) situated in the same organ, pr Process issuing 
from a cell; at a the sheath of this process is only 
transsected, we do not, therefore, see the origin of the 
process-contents in the protoplasm of the gat^glion cell. 
pn Nucleus situated in the sheath of the process. nt Nerve- 
tube. tn Nucleus situated in the sheath of the nerve-tube. 
(Hardened in potassium hicromate (2 — 3 'V,,) stained with 
neutral h or ax- car mine). 
» 100. (Magnified 11 50 diameters; Zeiss. Hom. im. Vis» 2.) 
Transsected nerve-tubes from a transverse section of the 
white substance. Int Large nerve-tubes (Miillers nerve- 
tubes) Inf Such tubes in which a slight concentration 
towards a deeply staining axis is visible, '/z^ Transsected small 
nerve-tubes. t Tubes or cell-processes running transversally 
between the longitudinal nerve-tubes. / Neuroglia fibres, 
which are, however, slightly visible in this section. (Fixed 
in saturated aqvous solution of picric acid, stained ac- 
cording to Heidenhain's hæmatoxylin method). 
