690 A. fF. Goldfarb 
ently uninjured anterior to 74 mm., Fig. 9. Between 74 and 
64 mm. the nerve cord was badly mutilated. In the next 2 mm. 
not the slightest trace of the cord was found, Fig. 10. The 
following 2 mm. however contained many mutilated pieces of the 
cord. For a short distance a crescent shaped mass of neuroglia 
cells is all that represents the cord, Fig. 11. These figures are all 
drawn to the same scale. A little farther there isa second diminu- 
tive sector of a cord which farther on, fusing with the first, forms 
an irregular double cord, Fig. 12. These end rather abruptly, 
but just before doing so four cords are seen almost fused together, 
I2 
13 
Figs.11to13 Same magnification as Figs.9 andro. Represents abortive attempts of broken pieces 
of the nerve cord to round out and complete themselves. 
Fig. 13. The concluding 2 mm. is absolutely cordless like Fig. 10. 
The regenerated tail throughout its length 1s likewise cordless. The 
mutilated cord between the two cordless areas gives rise to no nerve 
fibers nor to ganglion cells. Some dorsal ganglia had been totally 
destroyed, others only partially injured. The peculiar fragments 
and multiple cords, in all probability, represent pieces that had 
been severed at the time of the operation, and which had more or 
less successfully rounded out. No nerves however take their 
origin in these cords and no fibers are found in the regenerated 
tail. Other tissues, such as notochord, musculature, etc., were 
