674 A. Ff. Goldfarb 
Way to a narrow compact layer which in turn disappears close to 
I mm. from the end. The cord is here reduced to a mere ring 
of neuroglia cells, enclosing a large lumen, Fig. 6. Beyond this 
level there is no cord. 
That the broach has extended as far as 44 mm. from the end 
was shown by the cartilage that has proliferated from the injured 
inner lining of the neural arch, almost completely filling the space 
NEG R 
Fig. 6 Cross-section near posterior end of nerve cord, at early stage of regeneration. The cord 
consists of a single layer of cells. N, almost empty vertebral canal; NC, regenerated end of nerve 
. cord; G, part of sensory ganglion; R, proximal end of roots of the cord. 
between the arch proper and the diminutive cord. It will be 
remembered that this broach was as great or greater in diameter 
than the arch, so that the spirally wound teeth often destroyed not 
only the contents but injured the arch as well. The degenerate 
ventral roxts about 2 mm from the end were almost united by 
strands of connective tissue, and over them and separated from 
