BERRY— HINSEY: RECOVERY, REGENERATING NERVES 567 



A suture delayed for a longer period of 253 days resulted in less re- 

 constitution of the fiber diameters in the peripheral stump than that 

 found in the control. The histogram in figure 6 D was from the dis- 

 tal tibial, 3 cm. distal to the suture, which was delayed 253 days. 



DIAMETER IN MICRA 



Figure 6. The effects of delayed suture on fiber diameter growth in the distal stumps of re- 

 generating nerves. Control sutures with no delay, on the left (A, C, E) ; delayed sutures, on the 

 right (B, D, F). 



A is from th^ left tibial nerve, 105 days after immediate suture; B is from the right nerve of 

 the same cat, 105 days after a suture which was delayed 84 days; C and D, 440 days after suture 

 with 253 days delay in D ; E and F, 337 days after suture with 476 days delay in F. 



Figure 6 C was from the same level of the opposite tibial, with no delay. 

 Both nerves were allowed to regenerate for 440 days after suture, and 

 it must be pointed out that the longer regeneration period may be an 

 important factor. The fibers in figure 6 D were smaller throughout, 

 with a maximum diameter under 11 micra. On the control side, figure 

 6 C, the fibers were generally larger, with a few reaching 14 micra. 



The effects of delay were even more marked after 476 days, as shown 

 in FIGURE 6, E and F. The histogram in F, after 476 days delay, shows 

 most of the fibers to be less than 4 or 5 micra, while the histogram of 



