Donapson, Law of Innervation. 249 
On adding these three numbers together and then taking 
the proportional value of each of them, we find the following : 
TABLE XXII. 
Level Right Leg Left Leg 
C+5, et 
S, 29.4% 
LS il es aa) Oa A a ee 
This calculation could not be repeated for the left leg, as 
the sections for Si were imperfect. The remaining sections were, 
however, counted at levels C, S: and P1 + P2+T1+ T2 on the 
left leg, and gave numbers so closely similar to those from the 
right leg, that it is highly probable that the innervation of the 
two legs agreed closely. 
The tabulation of these same numbers in Frog B II is 
given below: 
TABLE XXIII. 
Right Leg Left Leg 
c+S, 51.6% 51.8% 
5, 30.2% 30.1% 
Pi -+2Pi+T1-+ T2 18.2%, 18.1% 
When we compare these percentages with the correspond- 
ing determinations for Frog B II, in which the two legs are 
quite similar, we find that CII has .8% more in the thigh, 
.8% less in the shank and that they exactly coincide as regards 
the foot. 
If we may judge from this, then other frogs are similar to 
B II in the general arrangement of the nerve supply to their 
legs, and hence the formula would be applicable to them as a 
class. 
In support of this view, we have the results of applying 
the formula to Frogs B and C. In these cases to be sure, both 
legs were examined, but the supply to the thigh alone was ob- 
served and therefore the comparison is limited to that segment 
of the limb. 
As the data for these calculations is to be found in Tables 
XII and XIII, it will be necessary to give only the comparison 
of the estimated number of fibers in each case with those 
observed. 
