1898 - 99 .] Dr Kennedy on Co-ordinated Movements . 
639 
By the 11th day evidence of sensation was obtained, and by 
the 14th day the recovery of function was complete. 
On the 49th day the physiological examination showed that 
reunion of the nerve had taken place both anatomically and 
physiologically. 
As regards recovery of function, therefore, these three experi- 
ments followed a practically identical course. 
The microscopic examination of the three sciatic nerves showed 
the following characters. 
The central segments showed the characters of the normal 
sciatic nerve, except in so far that the lymphatic spaces were 
somewhat distended, thus accounting for the increased thick- 
ness of the nerve which was microscopically evident. This 
character was maintained to within 5 mm. of the seat of 
section. 
The peripheral segments agreed in showing no old nerve fibres 
in any part examined, either close to the seat of reunion, or in the 
terminal divisions of the nerve. In their place were abundant 
young nerve fibres with well-defined characters. Lying between 
the young nerve fibres were degeneration remains of the old fibres, 
showing that Wallerian degeneration had taken place. 
The cicatricial segments were also all three practically identical 
in structure. In no case could continuity of nerve fibres from the 
central to the peripheral segment be traced in a single section. 
The arrangement of the young fibres was very irregular, the fibres 
running a very tortuous course, and showing, therefore, in the 
section cut in all directions. The sections closely resembled the 
appearance of a neuroma. 
The microscopic appearances of the seat of reunion leave it, 
therefore, doubtful whether the restoration of function in the two 
first cases was due to the re-establishment of the old paths for the 
nervous impulses by decussation in the cicatrix, or to the pro- 
duction of new paths by connections made between non-corre- 
sponding ends of nerve fibres. 
The conclusions from the physiological and histological results 
of the experiments are : — 
1st. That after section and immediate coaptation of a nerve* 
