664 A. Ff. Goldfarb 
The injury to the nerves was followed by paralysis of the limbs 
on the operated side. Succeeding events depended upon the 
nature of the injury. If all the plexus nerves had not been severed 
there was a return of motor functions within a few days. When 
all were cut, the limb did not move for 30 or more frequently 60 
days. In other animals where the nerve cord had been injured as 
well, both hind legs were paralyzed either permanently or tem- 
porarily. After successful operations, the limbs were insensible 
to strong stimuli, even though the motor nerves were intact, for 
the sensory branch of the reflex arc was destroyed. When sufh- 
cient time was allowed, both hind legs regenerated, the operated 
one considerably slower than its mate. 
No. 12.57. By the 39th day after the operation the right leg 
had grown 2 mm. long. No toes had been developed; the left 
leg showed externally no regeneration. It was paralyzed through- 
out the experiment. Serial sections proved that the three dorsal 
ganglia of the plexus had been entirely destroyed on the left side of 
the animal. Nota single ganglion cell could be found. The broken 
bony capsule was vacant except for pigment cells and a few connective 
tissue cells. ‘The cord had also been injured in this region. ‘The 
fibrous layer throughout the plexus had degenerated, and the 
cord has shrunken to about one-half its typical size; the lumen 1s 
irregular and eccentric. Concerning the plexus nerves, not enough 
time had elapsed for the degeneration of the fibers to have taken 
place except near the amputated end of the right limb. In the 
left (operated) leg, as might have been expected, the nerves are far 
more degenerate, bordering on complete disintegration. In this 
animal all the sensory and probably all the motor nerve stimuli as 
well were prevented from reaching the amputated end of the leg. 
Unfortunately not sufficient time had been allowed to make cer- 
tain whether the operated limb could or could not regenerate under 
these conditions. Within the limb merely a cap of cartilage 
had formed about the broken end of the bone shaft. The main 
question is thus left unanswered. 
In other cases, though three or more ganglia were totally de- 
stroyed, only two of these were plexus ganglia, as in 12.36, 12.50, 
12.51, etc. (Table 1). In some of these animals the cord had also 
