88 The Neuroglia of the Spinal Cord of the Elephant 
neuroglia nuclei may be observed with the characteristic investment of 
granular cytoplasm in varying amounts but the majority of the nuclei 
are seemingly “free” and mostly of the small, compact, deeply-staining 
variety. ‘The cytoplasm, when present, never shows the branched pro- 
cesses found in the substantia alba. 
In the white substance in general, the neuroglia fibers are colored 
deep blue and stand out in sharp distinctness against their environment. 
This contrast is most striking in sections involving the periphery of the 
Fic. 1. Portion of dorso-lateral periphery of transverse section from spinal cord 
of elephant showing a blood-vessel passing into the tissue of the cord proper and the 
relation and contrast in staining of the white fibrous tissue of the pia mater (p) to 
the neuroglia fibers forming the marginal veil (m) of the cord, together with the 
structure of the latter and the dense trabeculae of its fibers (0) passing in among the 
adjacent nerve fibers of the cord. Deep black in the drawing represents blue in the 
original, other shades represent pale brownish-red. The blood-vessel is seen to be 
accompanied not only by pial tissue (¢) but also by a thick sheath of neuroglia () 
acquired in passing through the marginal veil. x 870. 
spinal cord. Here the cortex of the cord or marginal veil (Randschleier 
of His) stands out as a deep blue, thick feltwork against the adjacent 
pia mater as shown in Figure 1. The pia (p) sends in a few thin strands 
of white fibrous tissue which interweave with the sharp blue neuroglia 
fibers but these strands are so thin as to be almost colorless. Being 
entirely void of nerve fibers to disperse them, the neuroglia fibers of 
the marginal veil (m) course thickly in all directions, forming a dense, 
intricate and admirable feltwork. It sends in processes (0) among the 
nerve fibers along its inner border in which the neuroglia fibers run 
