234 JoURNAL OF COMPARATIVE NEUROLOGY. 
TABLE X. 
Hereafter designated as the ‘‘formula’”’. 
46% go to the thigh 
25.3% go to the shank | eer shank 46.8% 
28.7% go tothelfoot ) {my Jo foot 53.2% 
100.0% go to the leg. 
If 46% go to the thigh, then 54% go to the remainder of 
the leg, i.e., shank and foot combined. Further, if we consider 
alone the fibers which go to the shank and foot and express 
the number as 100%, then of this 100% going to the shank 
and foot, 46.8% go to the shank and 53.2% to the foot. 
These calculations of the fibers distributed to the shank and 
foot are introduced here as they will be used later on. 
The values inthe above Table X are those with which 
all the subsequent calculations are made. It remains now to 
present the data concerning the number of nerve fibers 
observed to enter the leg of the frog and then to see in how far 
the estimated numbers for the segments of the leg correspond 
with the numbers which have been observed. 
These observed numbers have been obtained by Dr. 
Dunn. The designation of the frog and the segment or seg- 
ments for which the enumerations have been made, together 
with the date of publication, are given in the following Table 
XI in chronological order: 
TABLE Xl. 
Frog B Thigh DUNN 1900 
Frog C Thigh DUNN 1900 
Frog B II Thigh, Shank and Foot DUNN 1902 
Frog C II Thigh, Shank and Foot DUNN unpublished 
Below are given the details of the data for each frog so far 
as they will be required in this study. 
The accompanying Figure 2, taken from Dr. Dunn’s 
paper (1902), shows the levels at which the nerves for the 
frog’s leg were sectioned and where the number of fibers was. 
counted. 
