KBGENERATION OF PERIPHERAL NERVES 493 



lated fibers could be found. At 2.6 mm. proximal to the lesion 

 1999 fibers were found the control for this nerve being 1938. 

 Similar conditions exist for nos. 105 and 107. In these cases, 

 however, the animals being adults, the results are not so indic- 

 ative of profound disturbance in the growth processes. 



The data given in tables 5 and 6 have been used for the con- 

 struction of figure 1. In this figure the intent is to show by 

 the length of the transverse lines the number of fibers at the 

 given sectional level of the nerve; the location of the count 

 proximal or distal to the lesion is shown by the position of the 

 transverse line and is measured in micra by the scale on the 

 left, from zero, the point of the lesion. The solid portions of 

 the transverse lines indicate the number of fibers in the corre- 

 sponding left or control nerves — for the most part taken from 

 the middle zone of the control nerves — while the broken line 

 prolongations complete the representation for the operated nerve. 

 The values of these lines are given by the scale, ''number of 

 fibers^' at bottom of the figure. In entering the data from tables 

 5 and 6, the distance from the lesion used in the figure is inter- 

 mediate between the limiting values as given in the tables. 



CONFIRMING COMPOSITE RESULTS BY A NUMBER OF DETER- 

 MINATIONS ON THE SAME INDIVIDUAL 



Since the foregoing results are composite or based upon single 

 determinations made on the proximal and distal segments of 

 the operated nerves of a series of different animals, it seemed 

 advisable to verify them by a number of determinations made 

 at different levels on the operated nerve of the same animal. 



For this purpose Series 4 was operated and prepared. The 

 data relating to this series are presented in table 7 and arranged 

 according to the weights of the animals. The table gives the 

 counts made at different levels and indicates in micra the dis- 

 tances between the successive counts and also between the lesion 

 and the nearest proximal and the nearest distal counts. 



Referring to table 7, we observe that in each instance there 

 is a large increase in the number of fibers as we pass from the 

 first to the third count; the gain in number amounting to 249 



