Donatpson, Law of Lnnervation. 243 
percentage distribution of the fibers to the segments of the leg 
applies to the number of szxzgle medullated fibers found entering 
the leg at C+S; in this case, 7107 fibers. Having removed 
46% of this number for the innervation of the thigh, there 
remain 54% to be distributed to the shank and foot. 
Thus: 7107—3269=3838 fibers. 
The law calls for a distribution of this 54% of the initial 
number in the proportion of 25.3% to the shank and 28.7% 
to the foot. When, however, we attempt to deal with the 
splitting fibers belonging to the shank and foot in making the 
estimated comparable with the observed results, it is necessary 
to distribute these splitting fibers in the same proportions in 
the branches to the shank as they were distributed in the 
branches to the thigh, and in order to make the distribution in 
a like manner, it is necessary to treat the number of fibers 
going to the shank and foot, 3838, as 100% of all the fibers 
concerned, and then designate those to the shank as 46.8% of 
the same number, 
Since 46.8% of 3838=25.3% of 7107=1796 
53-2% of 3838=28.7% of 7107=2042 
According to the formula, therefore, 1796 fibers (single 
pathways) are estimated as going to the shank. Dr. DuNnN 
observed 2130 fibers to the shank, and further, by the same 
methods as were employed in the case of the thigh, she deter- 
mined that there were 465 splitting fibers in the branches to 
the shank. (See Table XIV.) 
In adjusting the estimated number to that observed, these 
splitting fibers are treated in the same manner as those found 
in the supply to the thigh, i. e., one-third are taken as 
dividing in the branches, and of the remainder it is assumed 
that 46.8% are included in the original estimate, so that 53.2% 
only need to be added to bring the estimate to the same stand- 
ard as that of the observed number. Thus, imitating Table 
XIX, for the thigh, we have the following: 
