678 A. ‘f. Goldfarb 
More than 5 mm. of the Nerve Cord Removed 
As much as 7 to 25 mm. of the nerve cord were destroyed 
from different levels of the tail and lumbar region of different indi- 
viduals. The time varied from 17 to 177 days. 
No. 1.19. Amputated distally; 9 mm. of the cord destroyed. 
Preserved 17 days later. “The cord was quite normal until 9 mm. 
from the distal end, where the fibrous layer had begun to degener- 
ate. Between g and 6 mm. from the end there is no distinct cord, 
merely scattered groups of broken down cells. Between 6 mm. 
and the end no trace of the cord could be found. ‘This case, shows 
that within 17 days degeneration of nerve fibers in the cord had 
already taken place.. 
No. 1.16. ‘Time, 25 days. ‘The distal 8 mm. was preserved 
and showed not the slightest trace of the nerve cord asin Fig. 2. 
No. 14.14. Tail stump, 30 mm. long; 7 mm. of the cord 
destroyed. ‘lime, 36 days; no regeneration. 
A very diminutive cord extends from the gth to the 6th mm., 
beyond which there is no sign of the cord. Regeneration of the 
new cord has taken place for a short distance in the manner briefly 
described in the preceding section. 
No. 1.1 A. Tail stump, 25mm. long. Needle pierced 12 mm. 
of the cord. ‘Time, 38 days. 
Only few fibers have degenerated anterior to the 12 mm. 
Between this level and 11 mm., considerable degenerative changes 
have taken place in both fibrous and cellular layers of the cord. 
Reparative changes have also set in. The neuroglia cells have 
multiplied greatly to form a double cord about 9 mm. from the 
end. Slightly posterior to this the vague outline of a third cord is 
found. Just beyond this point the two main cords fused together, 
and then with the third cord disappeared completely, leaving the 
distal 84 mm. cordless. 
The needle which had been used in operating had but broken 
or crushed the cord into fragments, some of which proliferated new 
cells to form the double and triple cords. The reparative changes 
are essentially like those discussed under “Partially Paralyzed 
Animals.” In the following three individuals no trace of the cord 
was found in the operated regions of the tail. 
