658 A. Ff. Goldfarb 
ated 54 mm. Right leg amputated 89 days after paralysis; 166 
days later or 255 days after paralysis, preserved. Regenerated 
6 mm. 
This animal differs from the preceding one in that the sensory 
nerves have regenerated still further, in fact to and beyond the 
amputated level of the leg. Near the cord the plexus nerves stain 
intensely black, almost as in control animals. It is hardly neces- 
sary to add that the regenerated legs contain no motor nerves. 
Lumbo-sacral Plexus Partially Destroyed 
The preceding experiments dealt exclusively with those individ- 
uals in which not the slightest movement of the hind limbs took 
place. It was found on examination that in every instance the 
cord had been totally removed from at least the lumbo-sacral region 
and usually from the region anterior to it, as well. 
The present section considers such animals from which only 
part of the nerve cord in the region of the plexus had been 
destroyed, thus allowing a more or less complete recovery from 
paralysis. ‘lhe time elapsing between the operation and the first 
voluntary movement or reaction to stimuli, varied considerably; 
so also did the extent of recovery vary. Some times the whole limb 
could move, in other animals the lower leg or only the toes; in 
some, both hind limbs, in others only one regained the power to 
move. ‘The results are extremely important, for they clearly show 
that 7f a minute part of the cord be left in the plexus region, subse- 
quent changes suffice to permit of some leg movements, and conversely 
when the limbs have. not moved for a long period, three or more 
months, this may be taken as presumptive evidence that all the motor 
nerve cells of the plexus have been destroyed. “The experiments also 
show that a certain amount of healing and regulation of the cord 
takes place, but this matter will receive further treatment later. 
No. 1.1 B. It was not intended at the time of operation that 
the cord in the plexus region should be injured. The tail stump 
was 2mm. long.*’ The cord was destroyed about 44 mm. Both 
legs amputated. After the operation the left lez moved normally. 
The right however did not move at all, but within a few days 
« The length of the tail was measured just behind the cloaca. 
