174 'Journal of Comparative Neurology and Psychology. 



in the figure in their relative positions, and the locations of the hip, 

 knee and crurotarsal joints are shown. 



It would follow from this, of course, that if we attempted to 

 determine, as Boycott did, the number of internodes character- 

 istic of the nerve between its origin and any distal point, we should 

 find this number to increase as the sample of the nerve was taken 

 nearer and nearer to the foot. This is exactly what we should 



TABLE 3. 



Showing the average diameters of the fibers and the lengths of the internodes at 

 the several levels in the nerves to the leg of Frog 6. Body weight, T,"] grams; 

 total length, 204 mm. For the identification of the levels, refer to Fig. I. 

 The number of measurements is given in parentheses above the length of the 

 internodes to which it applies. 



expect, as Dr. Dunn '02 has shown that the fibers of larger diame- 

 ter run the shorter courses. 



The foregoing result however does not inform us whether the 

 fibers of a given diameter in the same animal have internodes of 

 like length throughout their course. To determine this it is 

 necessary to measure series of fibers of like diameter at different 

 levels, and compare the results with one another. In Frog 6, 

 which furnished the material for Table 3 there is not a sufficient 



