REGENERATION OF PERIPHERAL NERVES 



491 



of the counts as measured from the point of lesion; the time 

 elapsed and the gain or loss in weight since the operation. 



We see from this table that the number of fibers found on the 

 proximal side of the lesion in the regenerated nerve 27 to 105 

 days after operation is always equal to or greater than that of 

 the corresponding control, since the one instance (no. Ill) in 

 which this number of proximal fibers is recorded as less than 

 that in the control is quite within the limits of normal varia- 

 tion, about 2 per cent. On the distal side, however, there are 

 several instances in which the number of fibers is distinctly less 

 than in the corresponding control nerve, although in most cases 

 it is largely in excess. 



Considering first the nerve proximal to the lesion, we find in 

 table 3 twelve instances (omitting no. 100) in wliich the distance 



* The control average at this level is ^ The control average at this level 



2047 is 1938 



2 The control average at this level is ■* The control average at this level 



1997 is 2023 



from the lesion to the level of the section has been measured. 

 A preliminary study of these enumerations arranged in the order 

 of their distance from the lesion showed that there was an evi- 

 dent though irregular increase in the number of fibers as the 

 section approached the level of the lesion. 



When we take the average of these records in successive groups 

 as they appear at intervals of 2 mm., we obtain the values given 

 in table 5. 



This table shows an increase of 1635 in the number of fibers 

 between the extremes or approximately 79 per cent of the smaller 

 number or 80 per cent of the most proximal control average as 

 we pass from a mean point 7 mm. proximal to the lesion toward 

 the immediate neighborhood of the lesion. 



