314 



Journal of Comparative Neurology. 



In the preceding study, Dunn, 1900, p. 233, the excess 



was from 6 to 8% of the observed number of fibers to the 



thigh. 



TABLE X. 



Showing the excess of the observed over the calculated fibers 

 innervating the thigh. 



Frog II B. 



Table XI, a similar table for the shank, shows for the left 

 side an excess of 448 fibers or 21 % of the observed number of 

 fibers and for the right side 465 fibers or 22 % of the number of 

 fibers found in the shank branches close to their points of 

 separation from the main trunks. 



TABLE XI. 

 Showing the excess of the observed over the calculated fibers to 

 the shank. 



Frog II B. 



This disparity between the observed and the calculated 

 numbers to the thigh, existing in each of the three frogs on 

 which observations have been made, can hardly be due to an 

 error in counting. The probable explanation, as pointed out in 

 the earlier discussion of this disparity, Dunn, 1900, p. 233, is 

 that of a branching of certain of the nerve fibers at some point 

 between the levels at which they were counted. In several 

 experimental teasings a number of large fibers were found in 

 the sciatic trunk dividing near the departure of the thigh 

 branches. 



Another point of interest is the greater percentage of 

 dividing fibers present in the shank. Their presence is ex- 



